Semester Exam Review - Teach-n-Learn-Chem
... Hydrogen atoms have specific energy levels. Therefore, the atoms can only gain or lose certain amounts of energy. When atoms lose energy, they emit photons which correspond to the lines in the emission spectrum. The more energy lost, the more energy the photon has. Bohr’s model stated that electrons ...
... Hydrogen atoms have specific energy levels. Therefore, the atoms can only gain or lose certain amounts of energy. When atoms lose energy, they emit photons which correspond to the lines in the emission spectrum. The more energy lost, the more energy the photon has. Bohr’s model stated that electrons ...
Lesson 13 - Highline Public Schools
... A chemist investigating a sample of lithium found that some lithium atoms have a lower mass than other lithium atoms. The chemist drew models of the two different types of lithium atoms, as shown on the following slide. ...
... A chemist investigating a sample of lithium found that some lithium atoms have a lower mass than other lithium atoms. The chemist drew models of the two different types of lithium atoms, as shown on the following slide. ...
3b Atomic Theory Overview Unit 3b OVERVIEW atomic theory
... Therefore, the electrons in an atom fill the principal energy levels in order of increasing energy (the electrons are getting farther from the nucleus). The order of levels filled looks like this: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, and 7p. 8. Hund’s Rule- each el ...
... Therefore, the electrons in an atom fill the principal energy levels in order of increasing energy (the electrons are getting farther from the nucleus). The order of levels filled looks like this: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, and 7p. 8. Hund’s Rule- each el ...
Chemistry I Honors – Semester Exam Review – Fall 2000
... Hydrogen atoms have specific energy levels. Therefore, the atoms can only gain or lose certain amounts of energy. When atoms lose energy, they emit photons which correspond to the lines in the emission spectrum. The more energy lost, the more energy the photon has. Bohr’s model stated that electrons ...
... Hydrogen atoms have specific energy levels. Therefore, the atoms can only gain or lose certain amounts of energy. When atoms lose energy, they emit photons which correspond to the lines in the emission spectrum. The more energy lost, the more energy the photon has. Bohr’s model stated that electrons ...
Review Packet
... 112. The measure of which a radioactive substance loses half of its radioactivity. 113. Where are the heaviest elements (greater than lead) created? 114. What is the type of decay that releases an electron and turns a neutron into a proton? 115. This equation states that the energy released by the r ...
... 112. The measure of which a radioactive substance loses half of its radioactivity. 113. Where are the heaviest elements (greater than lead) created? 114. What is the type of decay that releases an electron and turns a neutron into a proton? 115. This equation states that the energy released by the r ...
The Structure of the Atom
... Subatomic particles composed of fast moving points of energy called quarks Quark Calculations (for protons and neutrons) Each proton is 2 up quarks and 1 down quark 2(2/3) – 1(1/3) = 4/3 – 1/3 = 3/3 or +1 Each neutron is 2 down quarks and 1 up quark ...
... Subatomic particles composed of fast moving points of energy called quarks Quark Calculations (for protons and neutrons) Each proton is 2 up quarks and 1 down quark 2(2/3) – 1(1/3) = 4/3 – 1/3 = 3/3 or +1 Each neutron is 2 down quarks and 1 up quark ...
A Thumbnail Review of Regents Chemistry
... Radioisotope = unstable nucleus Atomic # 84 and above = only radioactive isotopes 1 ½ ¼ 1/8 = 3 half live events Half-Life Formula: # of decay events = time / half-life Medical isotopes = short half lives = 131I (thyroid) and 60Co (cancers) Dating Isotopes = long half-lives = 238U (rocks) and ...
... Radioisotope = unstable nucleus Atomic # 84 and above = only radioactive isotopes 1 ½ ¼ 1/8 = 3 half live events Half-Life Formula: # of decay events = time / half-life Medical isotopes = short half lives = 131I (thyroid) and 60Co (cancers) Dating Isotopes = long half-lives = 238U (rocks) and ...
Development of atomic theory
... developed by Max Planck and Albert Einstein to the problem of atomic structure. Bohr proposed that electrons could circle a nucleus without radiating energy only in orbits for which their orbital angular momentum was an integral multiple of Planck's constant h divided by 2π. The discrete spectral li ...
... developed by Max Planck and Albert Einstein to the problem of atomic structure. Bohr proposed that electrons could circle a nucleus without radiating energy only in orbits for which their orbital angular momentum was an integral multiple of Planck's constant h divided by 2π. The discrete spectral li ...
Periodic Trends - Barrington 220
... EXPLANATION: as electrons are added to more energy levels, the inner layers shield the outer electrons from the pull of the nucleus. The added electrons have less attraction to the nucleus due to this shielding effect, increasing the atom‛s size ...
... EXPLANATION: as electrons are added to more energy levels, the inner layers shield the outer electrons from the pull of the nucleus. The added electrons have less attraction to the nucleus due to this shielding effect, increasing the atom‛s size ...
Chemistry Review - pams-hoey
... • Formation of a NEW substance, not the original substance • Reactant: substance that enters into the reaction (original substance) • Product: substance that is produced by a chemical reaction (new substance) • The Law of Conservation of Mass states that mass remains constant in a chemical reaction ...
... • Formation of a NEW substance, not the original substance • Reactant: substance that enters into the reaction (original substance) • Product: substance that is produced by a chemical reaction (new substance) • The Law of Conservation of Mass states that mass remains constant in a chemical reaction ...
Notes-Periodic Table (2nd Part)
... Groups 3 to 12 Metals are called the (on the left and middle) transition metals More Metals These are actually located above in the 6th & 7th periods (rows) in group (column) three) ...
... Groups 3 to 12 Metals are called the (on the left and middle) transition metals More Metals These are actually located above in the 6th & 7th periods (rows) in group (column) three) ...
notes 4.1 & 4.2
... • Outermost ones are called valence electrons. They are responsible for how elements react with each other and the physical and chemical properties. ...
... • Outermost ones are called valence electrons. They are responsible for how elements react with each other and the physical and chemical properties. ...
elements in a family have the same number of
... Table salt has different properties than sodium, an explosive metal, and chlorine, a poisonous gas. ...
... Table salt has different properties than sodium, an explosive metal, and chlorine, a poisonous gas. ...
Atoms, Elements, and the Periodic Table Part 1: The Atomic Model
... The atomic model has changed over time. For over two centuries, scientists have created different models of the atom. ...
... The atomic model has changed over time. For over two centuries, scientists have created different models of the atom. ...
Atoms, Elements, and the Periodic Table Part 1: The Atomic Model
... The atomic model has changed over time. For over two centuries, scientists have created different models of the atom. ...
... The atomic model has changed over time. For over two centuries, scientists have created different models of the atom. ...
Atoms and Molecules
... Atoms are NOT indivisible – they can be broken apart into P+, neutrons, and e-. 2. Atoms can be changed from one element to another, but not by chemical means (chemical reactions). Can do it by nuclear reactions. 3. Atoms of the same element are NOT all exactly alike isotopes ...
... Atoms are NOT indivisible – they can be broken apart into P+, neutrons, and e-. 2. Atoms can be changed from one element to another, but not by chemical means (chemical reactions). Can do it by nuclear reactions. 3. Atoms of the same element are NOT all exactly alike isotopes ...
The Periodic Table - Academic Resources at Missouri Western
... Level III – 8 (first 20 elements) (18) Level IV – 32 ...
... Level III – 8 (first 20 elements) (18) Level IV – 32 ...
Bohr – Rutherford Diagrams
... draw a circle around the nucleus. This represents the first energy level; draw one small dot on the first energy level line for each electron calculated in step 1 (up to a maximum of 2 dots). Each dot represents 1 electron; if the atom contains more than 2 electrons, draw a second circle around the ...
... draw a circle around the nucleus. This represents the first energy level; draw one small dot on the first energy level line for each electron calculated in step 1 (up to a maximum of 2 dots). Each dot represents 1 electron; if the atom contains more than 2 electrons, draw a second circle around the ...
Inside the Atom 1. Atom – greek for cannot be divided. Democritus
... a. In the 1800s, scientists discovered that all matter is made up of elements either in pure form Au, Ag or Fe, or in combinations such as the molecules of H2O & NaCl b. 1st Model: Dalton – proposed that the atom was a hard sphere which was the same all the way through. Dalton’s idea of what atoms ...
... a. In the 1800s, scientists discovered that all matter is made up of elements either in pure form Au, Ag or Fe, or in combinations such as the molecules of H2O & NaCl b. 1st Model: Dalton – proposed that the atom was a hard sphere which was the same all the way through. Dalton’s idea of what atoms ...
Lesson Outline - WordPress.com
... * The atoms of one element Cannot be converted into atoms of another element in a chemical reaction. * All atoms of one element have the same properties, such has mass and size * Atoms of different elements combine in specific proportions to form compounds ...
... * The atoms of one element Cannot be converted into atoms of another element in a chemical reaction. * All atoms of one element have the same properties, such has mass and size * Atoms of different elements combine in specific proportions to form compounds ...