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19 Cards in this Set
- Front
- Back
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Which subatomic particle(s) are found in the nucleus of an atom? |
Protons and Neutrons |
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Experimental evidence indicates that the nucleus of an atom |
contains most of the mass of an atom |
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What is the charge and mass of a proton? |
charge of +1 and mass of 1 amu |
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Which statement best describes electrons? |
They are negative subatomic particles and found surrounding the nucleus. |
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How many electrons does O-2 have? |
10 |
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The atomic number is equal to |
the number of protons in the atom. |
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An atom of 52 24Cr has a nucleus that contains a total of |
24 neutrons |
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The atoms in a sample of an element must contain nucleus with the same number of |
Nuetrons |
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What is the total number of electrons in an atom of an element with an atomic number of 20 and a mass number of 40? |
20 |
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What is the mass number of an atom that contains 11 protons, 11 electrons, and 12 neutrons? |
23 |
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What is the mass number of 3 1H? |
1 |
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What is the total number of protons and neutrons in an atom of 91 40 Zr? |
40 |
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Isotopes are atoms that have the same number of protons but a different |
number of neutrons. |
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What is a symbol for an atom containing 36 protons and 48 neutrons? |
Kr |
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What is average atomic mass of Lithium if 7.42% exists as 6Li and 92.58% exists as 7Li? |
6.93 amu |
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An element occurs as a mixture of isotopes. The atomic mass of the element is based upon |
both the masses and the relative abundances of the individual isotopes. |
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Which energy level or shell can hold a maximum of 18 electrons? |
3 |
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For an aluminum atom, which energy level contains the most electrons? |
2 |
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How many electrons are in the outermost principle energy level (shell) of an atom of sodium? |
1 |
