Review – Chemistry Answers Essay

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A proton has a mass of ___ and a relative charge of ___
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1; +1
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A neutron has a relative mass of __ and a relative charge of ____.
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1;0
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An electron has a relative mass of __ and a relative charge of __.
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1/1836; -1
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The nucleus is at the center of the atom and contains the protons and neutrons. Protons and neutrons are collectively known as
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nucleons
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The atomic number of the atom is the number of
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protons
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the mass number of the atom is
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the number of protons + the number of neutrons. Also called the nucleon number.
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Isotopes
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atoms which have the same atomic number but different mass numbers. They have the same number of protons but different numbers of neutrons.
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Atoms are electrically neutral, and the positiveness of the protons is balanced by the negativeness of the electrons. It follows that in a neutral atom…
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the number of electrons equals the number of protons
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The electrons are found at considerable distances from the nucleus in a series of levels called energy levels. Which level holds how many electrons?
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level 1- 2 electrons level 2- 8 electrons level 3- 8 electrons. Electrons will always go into the lowest possible energy level provided there is space.
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Heisenberg Uncertainty Principle
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you can’t know with certainty both where an electron is and where it’s going next. That makes it impossible to plot an orbit for an electron around a nucleus
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orbital
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the region of space in which an electron lives

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