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| A proton has a mass of ___ and a relative charge of ___ |
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| A neutron has a relative mass of __ and a relative charge of ____. |
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| An electron has a relative mass of __ and a relative charge of __. |
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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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| The atomic number of the atom is the number of |
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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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| 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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| the region of space in which an electron lives |
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