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| The number of protons in a nucleus. (Atomic Number = # of Protons) |
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| Mass Number = # of Protons + # of Neutrons. |
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| Atoms of the same element with different numbers of neutrons in their nuclei. |
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| The seventh group in the periodic table. Immediately in front of the noble gases. |
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| The first group in the periodic table. |
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| The second group in the periodic table. |
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| The eighth group in the periodic table. Completely balanced and happy. |
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| Discovered the nucleus, using a foil experiment. |
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| Created a model of the atom, where electrons travelled in orbits to keep from being sucked into the nucleus. |
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| Discovered the electron and created the plum pudding model of the atom. |
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| Created an exclusion principle that said only two electrons can occupy any one atomic orbital. |
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| Created a principle that said electrons fill up in lowest energy. |
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| Created a rule that said the most stable arrangement of electrons in subshells is the one with the greatest number of parallel spins. |
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| The minimum energy required to remove an electron from a gaseous atom. Goes from bottom left to upper right. |
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| Cations are smaller, anions are larger. Goes from upper right to bottom left. |
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| Wants an electron the most. |
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Elements are made of extremely small particles called atoms.
Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
Atoms cannot be subdivided, created, or destroyed.
Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
In chemical reactions, atoms are combined, separated, or rearranged. |
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| The ease with which an atom gains an electron. Goes from bottom left to upper right. |
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| Gets smaller as you go to the right in periodic table, gets larger as you move down the groups. |
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| Going across a period, the ionic radius decreases for metals and increases for non-metal atoms. It increases going down a group. |
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