notes - unit 2 - atomic theory_key_2012
... ALL ELECTRONS MUST be drawn BOHRing 1. Look up electron configuration of element at hand on Periodic Table. If you are working with an ion, add/subtract the proper amount of electrons the last or VALENCE number in the configuration. Example: Oxygen is 2-6 2. Draw a square for the nucleus and notat ...
... ALL ELECTRONS MUST be drawn BOHRing 1. Look up electron configuration of element at hand on Periodic Table. If you are working with an ion, add/subtract the proper amount of electrons the last or VALENCE number in the configuration. Example: Oxygen is 2-6 2. Draw a square for the nucleus and notat ...
Atoms - Mrs. Lindenlaub
... Sizing up the Atom A coin the size of a penny and composed of pure copper (Cu) illustrates Dalton’s concept of the atom. Imagine grinding the copper coin into a fine dust. Each speck in the small pile of shiny red dust would still have the properties of copper. If by some means you could continue t ...
... Sizing up the Atom A coin the size of a penny and composed of pure copper (Cu) illustrates Dalton’s concept of the atom. Imagine grinding the copper coin into a fine dust. Each speck in the small pile of shiny red dust would still have the properties of copper. If by some means you could continue t ...
Critical Behavior of Electron Impact Ionization of Atoms
... nuclear charge for two-, three-, and nine-electron atoms. We show, using the Born approximation along with a simple one-particle model, that the cross section tends to large values as the nuclear charge tends to its critical value. In a previous study for two- and threeelectron atoms, we have used t ...
... nuclear charge for two-, three-, and nine-electron atoms. We show, using the Born approximation along with a simple one-particle model, that the cross section tends to large values as the nuclear charge tends to its critical value. In a previous study for two- and threeelectron atoms, we have used t ...
O usually has oxidation number of -2, except in peroxides where it is
... The sum of the oxidation numbers of the elements in a polyatomic ion must equal the ion charge. Consider these examples. If there are two poly atomic ions in a compound deal with them first. e.g. Carbonate ion, . O has oxidation number of -2. There are 3O’s in the formula so the total negative charg ...
... The sum of the oxidation numbers of the elements in a polyatomic ion must equal the ion charge. Consider these examples. If there are two poly atomic ions in a compound deal with them first. e.g. Carbonate ion, . O has oxidation number of -2. There are 3O’s in the formula so the total negative charg ...
CHEMISTRY Test 3: Atomic Structure
... b. balances the charge on the nucleus. c. attracts electron clouds in other atoms to form compounds. d. does not exist. ____ 12. The smallest unit of an element that can exist either alone or in combination with other such particles of the same or different elements is the a. electron. c. neutron. b ...
... b. balances the charge on the nucleus. c. attracts electron clouds in other atoms to form compounds. d. does not exist. ____ 12. The smallest unit of an element that can exist either alone or in combination with other such particles of the same or different elements is the a. electron. c. neutron. b ...
EL Study Notes
... helium nuclei. Energy is released in these nuclear fusion reactions. Although the production of each helium nucleus only releases 4 x 10-12J, the Sun makes 1038 helium nuclei per second. As a result the Sun’s energy output is enormous. It has enough hydrogen for around 5 billion years when it will e ...
... helium nuclei. Energy is released in these nuclear fusion reactions. Although the production of each helium nucleus only releases 4 x 10-12J, the Sun makes 1038 helium nuclei per second. As a result the Sun’s energy output is enormous. It has enough hydrogen for around 5 billion years when it will e ...
X PS EM - deo kadapa
... For example: Mg + Hcl → Mgcl2 +H2 Here, the number of chlorine and hydrogen atoms are not equal on both sides. 5. Write the skeletal equation for the following reactions. (a) Hydrogen sulphide reacts with sulphur dioxide to form sulphur and water. (b) Methane on burning combines with oxygen to produ ...
... For example: Mg + Hcl → Mgcl2 +H2 Here, the number of chlorine and hydrogen atoms are not equal on both sides. 5. Write the skeletal equation for the following reactions. (a) Hydrogen sulphide reacts with sulphur dioxide to form sulphur and water. (b) Methane on burning combines with oxygen to produ ...
Section 3 Electron Configurations
... atomic orbitals and the properties of electrons in orbitals. 1. The principal quantum number, symbolized by n, indicates the main energy level occupied by the electron. 2.The angular momentum quantum number, symbolized by l, indicates the shape of the orbital. ...
... atomic orbitals and the properties of electrons in orbitals. 1. The principal quantum number, symbolized by n, indicates the main energy level occupied by the electron. 2.The angular momentum quantum number, symbolized by l, indicates the shape of the orbital. ...
Chapter 3
... Foundations of Atomic Theory, continued • Law of definite proportions: a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound • Law of multiple proportions: if two or more different compounds are composed ...
... Foundations of Atomic Theory, continued • Law of definite proportions: a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound • Law of multiple proportions: if two or more different compounds are composed ...
CHEM 1405 Practice Exam #2 (2015)
... 7) Which fourth period transition element has the highest atomic number? A) Ca B) Cd C) Kr D) Zn C) Sb and Te D) Po and At C) Ca D) none of the above 8) Which of the following elements are fourth period metalloids? A) Si and Ge B) Ge and As 9) Which of the following is an alkali metal? A) Al B) Fe 1 ...
... 7) Which fourth period transition element has the highest atomic number? A) Ca B) Cd C) Kr D) Zn C) Sb and Te D) Po and At C) Ca D) none of the above 8) Which of the following elements are fourth period metalloids? A) Si and Ge B) Ge and As 9) Which of the following is an alkali metal? A) Al B) Fe 1 ...
Regents Chemistry Topic Review Packet
... You can recognize an excited state electron configuration. If the configuration does not match that on the Periodic Table for that number of electrons, then it is an excited state. 9. When an electron returns from a higher energy state to a lower energy state, it emits a specific amount of energy ...
... You can recognize an excited state electron configuration. If the configuration does not match that on the Periodic Table for that number of electrons, then it is an excited state. 9. When an electron returns from a higher energy state to a lower energy state, it emits a specific amount of energy ...
Regents Chemistry Topic Review Packet
... You can recognize an excited state electron configuration. If the configuration does not match that on the Periodic Table for that number of electrons, then it is an excited state. 9. When an electron returns from a higher energy state to a lower energy state, it emits a specific amount of energy ...
... You can recognize an excited state electron configuration. If the configuration does not match that on the Periodic Table for that number of electrons, then it is an excited state. 9. When an electron returns from a higher energy state to a lower energy state, it emits a specific amount of energy ...
1.9 M - Thierry Karsenti
... 2. Atom: the smallest particle of an element that retains the identify and properties of the element and can take part in a chemical change. 3. Atomic number (symbol Z): the number of protons in the nucleus of each atom. 4. Compound: a substance that is formed when two or more elements combine chemi ...
... 2. Atom: the smallest particle of an element that retains the identify and properties of the element and can take part in a chemical change. 3. Atomic number (symbol Z): the number of protons in the nucleus of each atom. 4. Compound: a substance that is formed when two or more elements combine chemi ...
“Midterm” Exam # 1 - Elgin Community College
... 35) (6 pts) If you have 200 g of CaCl2, how many grams of a 20.% (m/m) solution can your prepare? How much water do you need to use (mL)? Show ALL of your work for credit ...
... 35) (6 pts) If you have 200 g of CaCl2, how many grams of a 20.% (m/m) solution can your prepare? How much water do you need to use (mL)? Show ALL of your work for credit ...
CHAPTER 11 Introduction to Atoms
... Scientists must determine the atomic number, or the number of protons, in the newly formed nucleus. The nucleus is that of a new element only if the number of protons is different from all known elements. ...
... Scientists must determine the atomic number, or the number of protons, in the newly formed nucleus. The nucleus is that of a new element only if the number of protons is different from all known elements. ...
energy A
... Waves are associated with electrons Information about energies of electrons and their positions are obtained from studying the associated waves Description of electron is based upon “ Probability of finding a particle within a given region of space” “ but not on the exact position” ...
... Waves are associated with electrons Information about energies of electrons and their positions are obtained from studying the associated waves Description of electron is based upon “ Probability of finding a particle within a given region of space” “ but not on the exact position” ...
printer-friendly version
... All around us are objects. In school, we see desks, chairs, books, students and teachers. Perhaps you ride to and from school on a school bus that drives over a road paved in asphalt, and you see buildings, clouds, sky, cars and trees on your ride. All of these objects are composed of matter. These ...
... All around us are objects. In school, we see desks, chairs, books, students and teachers. Perhaps you ride to and from school on a school bus that drives over a road paved in asphalt, and you see buildings, clouds, sky, cars and trees on your ride. All of these objects are composed of matter. These ...
Chapter 3 - SaddleSpace/Haiku
... I. Foundations of Atomic Theory Ex. CO and CO2: For the same mass of carbon, the mass of the O in CO to the mass of O in CO2 will be 1:2 If you had 28 g of CO and 44 g of CO2, both would contain 12 g of C. The CO would contain 16 g of O and the CO2 would contain 32 g of O. ...
... I. Foundations of Atomic Theory Ex. CO and CO2: For the same mass of carbon, the mass of the O in CO to the mass of O in CO2 will be 1:2 If you had 28 g of CO and 44 g of CO2, both would contain 12 g of C. The CO would contain 16 g of O and the CO2 would contain 32 g of O. ...
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.