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Thompson`s “Plum Pudding” Model
... model. Rutherford was forced to discard the Plum Pudding model. • He reasoned that the only way the alpha particles (positively charged) could be deflected backwards was if most of the mass in an atom was concentrated in a nucleus. • He thus developed the “Planetary model” of the atom which put all ...
... model. Rutherford was forced to discard the Plum Pudding model. • He reasoned that the only way the alpha particles (positively charged) could be deflected backwards was if most of the mass in an atom was concentrated in a nucleus. • He thus developed the “Planetary model” of the atom which put all ...
Section 2.1
... • All atoms of a given element are identical to one another in mass and other properties, but atoms of an element are unique to that element only. • Atoms of an element are not changed into atoms of a different element by chemical reactions; they are neither created nor destroyed. • Compounds are fo ...
... • All atoms of a given element are identical to one another in mass and other properties, but atoms of an element are unique to that element only. • Atoms of an element are not changed into atoms of a different element by chemical reactions; they are neither created nor destroyed. • Compounds are fo ...
Atomic Structure Fall 2012
... which was only a few atoms thick. they found that although most of them passed through. About 1 in 10,000 hit ...
... which was only a few atoms thick. they found that although most of them passed through. About 1 in 10,000 hit ...
Atomic Theory Magic Squares Democritus _____ Dalton _____
... Magic Number ______ 1. Represented by a symbol; all are found on the Periodic Table 2. Made a mental model of the atom; Greek philosopher who used the word “atomos” 3. Used by Rutherford in his experiment; made of two protons and two neutrons 4. The paths in which electrons circle the nucleus accord ...
... Magic Number ______ 1. Represented by a symbol; all are found on the Periodic Table 2. Made a mental model of the atom; Greek philosopher who used the word “atomos” 3. Used by Rutherford in his experiment; made of two protons and two neutrons 4. The paths in which electrons circle the nucleus accord ...
Classification of Matter
... The Periodic Table is used to organize the elements according to similarities in chemical properties. Periodic Table The Periodic Table is more than a list of elements. The Periodic Law states that Chemical and Physical properties repeat in a regular pattern when the elements are arranged according ...
... The Periodic Table is used to organize the elements according to similarities in chemical properties. Periodic Table The Periodic Table is more than a list of elements. The Periodic Law states that Chemical and Physical properties repeat in a regular pattern when the elements are arranged according ...
- Catalyst
... therefore they differ in mass (more on amu in Ch 3). • Many isotopes occur in nature. Most natural isotopes are not radioactive, nor are they necessarily harmful. • A sample of an element will contain some percentage of all its isotopes. ...
... therefore they differ in mass (more on amu in Ch 3). • Many isotopes occur in nature. Most natural isotopes are not radioactive, nor are they necessarily harmful. • A sample of an element will contain some percentage of all its isotopes. ...
The Structure of an Atom
... Discovering the Atom •JJ Thomson (1856-1940)- in the 1890’s found a cathode ray could be deflected by magnetic and electric fields. He concluded the ray was a stream of negatively charged particles dislodged from an atom with a mass much less than a hydrogen atom. ...
... Discovering the Atom •JJ Thomson (1856-1940)- in the 1890’s found a cathode ray could be deflected by magnetic and electric fields. He concluded the ray was a stream of negatively charged particles dislodged from an atom with a mass much less than a hydrogen atom. ...
2:1 Foundations of Atomic Theory In the 1790s the study of matter
... ATOMIC NUMBER (Z) of an element is the number of protons of each atom of that element, so it identifies an element. The atomic number can be found above an element’s symbol on the periodic table. Elements are arranged in the Periodic Table in increasing atomic number. Ex.- Silver [Ag] has an atomic ...
... ATOMIC NUMBER (Z) of an element is the number of protons of each atom of that element, so it identifies an element. The atomic number can be found above an element’s symbol on the periodic table. Elements are arranged in the Periodic Table in increasing atomic number. Ex.- Silver [Ag] has an atomic ...
Atoms, Molecules and Ions
... The atomic mass of an element is the mass average of the atomic masses of the different isotopes of an element. For example, naturally occurring carbon, for example, is a mixture of two isotopes, 12C (98.89%) and 13C (1.11 %). Individual carbon atoms therefore have a mass of either 12.000 or 13.0335 ...
... The atomic mass of an element is the mass average of the atomic masses of the different isotopes of an element. For example, naturally occurring carbon, for example, is a mixture of two isotopes, 12C (98.89%) and 13C (1.11 %). Individual carbon atoms therefore have a mass of either 12.000 or 13.0335 ...
Overview Atomic Structure
... experiments. He developed an atomic theory. 1. Elements are made of extremely small particles called atoms. 2. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties. 3. Atoms cannot be subdivided, created, o ...
... experiments. He developed an atomic theory. 1. Elements are made of extremely small particles called atoms. 2. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties. 3. Atoms cannot be subdivided, created, o ...
Introduction to Atoms
... 1. The nucleus is the center of the atom. 2. Protons and neutrons are found in the nucleus. 3. Protons have a positive charge. 4. Protons are very large (compared to electrons) a) A proton’s mass is about 1.00 amu (1840 times greater than the mass of an electron!) ...
... 1. The nucleus is the center of the atom. 2. Protons and neutrons are found in the nucleus. 3. Protons have a positive charge. 4. Protons are very large (compared to electrons) a) A proton’s mass is about 1.00 amu (1840 times greater than the mass of an electron!) ...
Bohr-Rutherford Lewis Dot Diagrams Worksheet
... Draw the nucleus by first writing the symbol of the element and indicating the number of protons (p) and neutrons (n). Step 3: Draw the electrons in their orbits. Only a certain number of electrons can be held in each orbit: - fill the lower orbits (or energy levels) first - the first orbit will hol ...
... Draw the nucleus by first writing the symbol of the element and indicating the number of protons (p) and neutrons (n). Step 3: Draw the electrons in their orbits. Only a certain number of electrons can be held in each orbit: - fill the lower orbits (or energy levels) first - the first orbit will hol ...
Bohr-Rutherford Lewis Dot Diagrams Worksheet
... Draw the nucleus by first writing the symbol of the element and indicating the number of protons (p) and neutrons (n). Step 3: Draw the electrons in their orbits. Only a certain number of electrons can be held in each orbit: - fill the lower orbits (or energy levels) first - the first orbit will hol ...
... Draw the nucleus by first writing the symbol of the element and indicating the number of protons (p) and neutrons (n). Step 3: Draw the electrons in their orbits. Only a certain number of electrons can be held in each orbit: - fill the lower orbits (or energy levels) first - the first orbit will hol ...
File - Mrs. Wernau`s Pre
... John Dalton’s atomic theory: 1. All matter is made up of very tiny particles called atoms 2. Atoms of the same element are alike…same size, mass, and other properties. 3. Atoms are not subdivided, created, or destroyed. 4. Atoms of different elements combine in simple whole-number ratios to form che ...
... John Dalton’s atomic theory: 1. All matter is made up of very tiny particles called atoms 2. Atoms of the same element are alike…same size, mass, and other properties. 3. Atoms are not subdivided, created, or destroyed. 4. Atoms of different elements combine in simple whole-number ratios to form che ...
Name: ___________ Class: _____ Date: _______________ FALL
... ____ 10. A chemical change occurs when a. ice melts to water. b. paper rips in half. c. sugar is dissolved in a solution. d. an unexpected color change occurs. ____ 11. Which sign does NOT indicate that a chemical change has occurred? a. color change. c. energy absorbed or released. b. dissolving i ...
... ____ 10. A chemical change occurs when a. ice melts to water. b. paper rips in half. c. sugar is dissolved in a solution. d. an unexpected color change occurs. ____ 11. Which sign does NOT indicate that a chemical change has occurred? a. color change. c. energy absorbed or released. b. dissolving i ...
The Bohr Model of the Atom
... positively charged nucleus surrounded by electrons explained a few properties of atoms, but not all. • In particular, it did not explain why many atoms emit light of specific frequencies when heated. • Rutherford also could not explain why electrons did not collapse into the nucleus. ...
... positively charged nucleus surrounded by electrons explained a few properties of atoms, but not all. • In particular, it did not explain why many atoms emit light of specific frequencies when heated. • Rutherford also could not explain why electrons did not collapse into the nucleus. ...
The Atom
... Energy needed to remove one electron from an atom in the gas state It measures how tightly an atom holds its electrons The lower the ionization energy, the easier it is to remove the electron Metals have low ionization energies Nonmetals have high ionization energies Ionization Energy decr ...
... Energy needed to remove one electron from an atom in the gas state It measures how tightly an atom holds its electrons The lower the ionization energy, the easier it is to remove the electron Metals have low ionization energies Nonmetals have high ionization energies Ionization Energy decr ...
Distinguishing Among Atoms
... An orbital is a region of space around the nucleus where an electron is likely to be found ...
... An orbital is a region of space around the nucleus where an electron is likely to be found ...
module for international standard class
... The chemical equation is the symbolic representation of a chemical reaction in term of chemical formulas. The chemical formula of a substance is a notation that uses atomic symbols with numerical subscript to convey the relative proportions of atom of the different elements in the substance. The che ...
... The chemical equation is the symbolic representation of a chemical reaction in term of chemical formulas. The chemical formula of a substance is a notation that uses atomic symbols with numerical subscript to convey the relative proportions of atom of the different elements in the substance. The che ...
objectives chm 1025 - Miami Dade College
... c. Comparing and contrasting the particle and wave description of light. d. Relating important advances made in atomic theory to electronic emission and absorption spectra. e. Giving some of the very basic tenants involved in the quantum mechanical picture of the atom. f. Generating a viable set of ...
... c. Comparing and contrasting the particle and wave description of light. d. Relating important advances made in atomic theory to electronic emission and absorption spectra. e. Giving some of the very basic tenants involved in the quantum mechanical picture of the atom. f. Generating a viable set of ...
Metals
... •Ordered elements by atomic mass •Repeating pattern of properties •Elements with similar properties in the same column Periodic Law – when the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically. Patterns used to predict properties of undiscovere ...
... •Ordered elements by atomic mass •Repeating pattern of properties •Elements with similar properties in the same column Periodic Law – when the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically. Patterns used to predict properties of undiscovere ...
Chemistry - Edgbarrow School
... I can name the main I can represent chemical reactions out simple techniques for changes of state, there are Periodic Table was materials are more reactive elements that make up the using word equations separating mixtures energy changes developed by Mendeleev than others composition of the Earth ...
... I can name the main I can represent chemical reactions out simple techniques for changes of state, there are Periodic Table was materials are more reactive elements that make up the using word equations separating mixtures energy changes developed by Mendeleev than others composition of the Earth ...
Periodic table
The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number (number of protons in the nucleus), electron configurations, and recurring chemical properties. The table also shows four rectangular blocks: s-, p- d- and f-block. In general, within one row (period) the elements are metals on the lefthand side, and non-metals on the righthand side.The rows of the table are called periods; the columns are called groups. Six groups (columns) have names as well as numbers: for example, group 17 elements are the halogens; and group 18, the noble gases. The periodic table can be used to derive relationships between the properties of the elements, and predict the properties of new elements yet to be discovered or synthesized. The periodic table provides a useful framework for analyzing chemical behavior, and is widely used in chemistry and other sciences.Although precursors exist, Dmitri Mendeleev is generally credited with the publication, in 1869, of the first widely recognized periodic table. He developed his table to illustrate periodic trends in the properties of the then-known elements. Mendeleev also predicted some properties of then-unknown elements that would be expected to fill gaps in this table. Most of his predictions were proved correct when the elements in question were subsequently discovered. Mendeleev's periodic table has since been expanded and refined with the discovery or synthesis of further new elements and the development of new theoretical models to explain chemical behavior.All elements from atomic numbers 1 (hydrogen) to 118 (ununoctium) have been discovered or reportedly synthesized, with elements 113, 115, 117, and 118 having yet to be confirmed. The first 94 elements exist naturally, although some are found only in trace amounts and were synthesized in laboratories before being found in nature. Elements with atomic numbers from 95 to 118 have only been synthesized in laboratories. It has been shown that einsteinium and fermium once occurred in nature but currently do not. Synthesis of elements having higher atomic numbers is being pursued. Numerous synthetic radionuclides of naturally occurring elements have also been produced in laboratories.