Summary 4.1 Studying Atoms
... word atomos, which means “uncut” or “indivisible.” Aristotle did not think there was a limit to the number of times matter could be divided. By the 1800s, scientists had enough data from experiments to support an atomic model of matter. The English scientist John Dalton developed a theory to explain ...
... word atomos, which means “uncut” or “indivisible.” Aristotle did not think there was a limit to the number of times matter could be divided. By the 1800s, scientists had enough data from experiments to support an atomic model of matter. The English scientist John Dalton developed a theory to explain ...
Atom Notes Outline - Sewanhaka Central High School District
... 1. An atom of Lithium (Li) has a mass # of 7. Find the following: Atomic #: _______________ # of protons: ____________ # of neutrons: ____________ # of electrons: ___________ 2. Find the following with regard to 39K: ...
... 1. An atom of Lithium (Li) has a mass # of 7. Find the following: Atomic #: _______________ # of protons: ____________ # of neutrons: ____________ # of electrons: ___________ 2. Find the following with regard to 39K: ...
Unit 1 Problem Set
... 14. Identify which of the following provide evidence to support the Bohr model of the hydrogen atom? I The energy of the lines in the emission spectra of atomic hydrogen. II The energy of the missing lines in the absorption spectra of helium as seen from the sun. III The relative intensity of the di ...
... 14. Identify which of the following provide evidence to support the Bohr model of the hydrogen atom? I The energy of the lines in the emission spectra of atomic hydrogen. II The energy of the missing lines in the absorption spectra of helium as seen from the sun. III The relative intensity of the di ...
PPT Test Review
... Potassium (K) has ___ valence electron. Oxygen (O) has ______ valence electrons. Potassium will _____ its valence electron to Oxygen. ...
... Potassium (K) has ___ valence electron. Oxygen (O) has ______ valence electrons. Potassium will _____ its valence electron to Oxygen. ...
Periodic Trends & the Periodic Table
... elements is called the lanthanides because they follow element number 57, lanthanum. • The second series of inner transition elements, the actinides, have atomic numbers ranging from 90 (thorium, Th) to 103 (lawrencium, Lr). ...
... elements is called the lanthanides because they follow element number 57, lanthanum. • The second series of inner transition elements, the actinides, have atomic numbers ranging from 90 (thorium, Th) to 103 (lawrencium, Lr). ...
Periodic Trends
... attraction to the valence electrons (which are increasing as well). This pulls the valence electrons closer to the nucleus. Going down the periodic table, atomic radius tends get bigger within a group. Even though the number of protons is increasing, new energy levels are added as you move down whic ...
... attraction to the valence electrons (which are increasing as well). This pulls the valence electrons closer to the nucleus. Going down the periodic table, atomic radius tends get bigger within a group. Even though the number of protons is increasing, new energy levels are added as you move down whic ...
Chapter Three: Atoms and Atomic Masses
... We symbolize this ion as Al3+. Note that losing electrons is indicated with +, and gaining electrons is indicated with -. ...
... We symbolize this ion as Al3+. Note that losing electrons is indicated with +, and gaining electrons is indicated with -. ...
PERIODIC CLASSIFICATION OF ELEMENTS
... polonium – are intermediate in properties and are called metalloids or semi-metals. Metals tend to lose electrons while forming bonds, that is, they are electropositive in ...
... polonium – are intermediate in properties and are called metalloids or semi-metals. Metals tend to lose electrons while forming bonds, that is, they are electropositive in ...
Study Guide Chapter 6
... (c) octet: 8 electrons in the outer level of an atom. (d) octet rule: 8 electrons in the outer level of an atom makes it very stable. (e) duet rule: 2 electrons will stabilize an atom with only one energy level. (f) semiconductor: An element which is neither a good conductor or a good insulator, but ...
... (c) octet: 8 electrons in the outer level of an atom. (d) octet rule: 8 electrons in the outer level of an atom makes it very stable. (e) duet rule: 2 electrons will stabilize an atom with only one energy level. (f) semiconductor: An element which is neither a good conductor or a good insulator, but ...
Chapter 4 Power Point
... that have different numbers of neutrons and different mass numbers. Isotopes of an element have the same atomic number but different mass numbers because they have different numbers of neutrons. ...
... that have different numbers of neutrons and different mass numbers. Isotopes of an element have the same atomic number but different mass numbers because they have different numbers of neutrons. ...
Chemistry 1000 Lecture 9: Periodic trends
... Metallic radius: Same idea as the covalent radius, but in a metal. What’s the difference, then? In a covalent compounds, some of the valence electrons are shared between two atoms. In a metallic compound, the valence electrons are shared throughout the metal. van der Waals radius: Mostly for noble g ...
... Metallic radius: Same idea as the covalent radius, but in a metal. What’s the difference, then? In a covalent compounds, some of the valence electrons are shared between two atoms. In a metallic compound, the valence electrons are shared throughout the metal. van der Waals radius: Mostly for noble g ...
What are the parts of an atom?
... •Scientists now know that atoms are made of even smaller particles, but the atom is the smallest unit that has the ______________________________properties of an element. ...
... •Scientists now know that atoms are made of even smaller particles, but the atom is the smallest unit that has the ______________________________properties of an element. ...
The Modern View of Atomic Structure
... A radioactive substance is placed in a shield containing a small hole so that a beam of radiation is emitted from the hole. The radiation is passed between two electrically charged plates and detected. Three spots are noted on the detector: a spot in the direction of the positive plate, a spot which ...
... A radioactive substance is placed in a shield containing a small hole so that a beam of radiation is emitted from the hole. The radiation is passed between two electrically charged plates and detected. Three spots are noted on the detector: a spot in the direction of the positive plate, a spot which ...
Bonding
... c.In terms of atomic structure, explain why the first ionization energy of selenium is i. less than that of bromine (atomic number 35), and ii.greater than that of tellurium (atomic number 52). d.Selenium reacts with fluorine to form SeF4. Draw the complete Lewis electron dot structure for SeF4 and ...
... c.In terms of atomic structure, explain why the first ionization energy of selenium is i. less than that of bromine (atomic number 35), and ii.greater than that of tellurium (atomic number 52). d.Selenium reacts with fluorine to form SeF4. Draw the complete Lewis electron dot structure for SeF4 and ...
The Atom
... - Atoms of the same element are exactly alike - atoms of Different Elements are different - compounds are made by joining elements ______________________- atoms have positive and negative particles _________________________- 1908 an English physicist -atoms are mostly empty space - have a small dens ...
... - Atoms of the same element are exactly alike - atoms of Different Elements are different - compounds are made by joining elements ______________________- atoms have positive and negative particles _________________________- 1908 an English physicist -atoms are mostly empty space - have a small dens ...
Trends on the Periodic Table
... diatomic molecules in their elemental form. Noble gases (18)—Known for their extremely low reactivity, these were once thought to never react; neon, one of the noble gases, is used to make ...
... diatomic molecules in their elemental form. Noble gases (18)—Known for their extremely low reactivity, these were once thought to never react; neon, one of the noble gases, is used to make ...
History of the Atom
... Discovered/proposed that combustion occurs when oxygen combines with other elements Discovered/proposed the Law of Conservation of Mass (or Matter) which states, in a chemical reaction, matter is neither created nor destroyed Image taken from: ...
... Discovered/proposed that combustion occurs when oxygen combines with other elements Discovered/proposed the Law of Conservation of Mass (or Matter) which states, in a chemical reaction, matter is neither created nor destroyed Image taken from: ...
Unit #4 Periodic Table Families Notes
... – When an atom or molecule gain or loses an electron it becomes an ion. • A cation has lost an electron and therefore has a positive charge • An anion has gained an electron and therefore has a negative charge. ...
... – When an atom or molecule gain or loses an electron it becomes an ion. • A cation has lost an electron and therefore has a positive charge • An anion has gained an electron and therefore has a negative charge. ...
The Periodic Table notes
... Elements to the right of the zig-zagged line on the periodic table with the exception of Hydrogen. Hydrogen is a nonmetal but to the left of the periodic table. ...
... Elements to the right of the zig-zagged line on the periodic table with the exception of Hydrogen. Hydrogen is a nonmetal but to the left of the periodic table. ...
Which has more atoms: a one gram sample of carbon
... Atoms of the same element may have different numbers of neutrons. Carbon may have 6, 7 or 8 neutrons. Hydrogen may have 0, 1 or 2 neutrons. These are called isotopes. Most elements have more than one isotope. Some isotopes are radioactive. Unstable, decay into other elements. Example: ...
... Atoms of the same element may have different numbers of neutrons. Carbon may have 6, 7 or 8 neutrons. Hydrogen may have 0, 1 or 2 neutrons. These are called isotopes. Most elements have more than one isotope. Some isotopes are radioactive. Unstable, decay into other elements. Example: ...
The Atomic Model
... •Atoms are neither created or destroyed (under normal chemical reactions) – Law of Definite Proportion, (Proust's Law) •Atom ratio is fixed, so mass must be constant. – Law of Multiple Proportions (Dalton) •Applies where two elements, A and B, form more than one compound. ...
... •Atoms are neither created or destroyed (under normal chemical reactions) – Law of Definite Proportion, (Proust's Law) •Atom ratio is fixed, so mass must be constant. – Law of Multiple Proportions (Dalton) •Applies where two elements, A and B, form more than one compound. ...