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| matter that is uniform in its chemical composition & properties |
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| blend of 2 or more pure substances in any ratio each retaining their identity. |
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| pure substance, cant be broken down |
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| 2 or more elements combined chemically in specific ratios to form a pure substance |
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| Identical atomic numbers (Z) but different mass numbers (A) |
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| Subshells are in order of what |
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| loses 2 protons & 2 neutrons |
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| decomposition of a neutron to yield an electron & a proton |
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| loss of one or more electrons from a neutral atom. cation is positively charged |
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| Gain of one or more electrons by a neutral atom. Anion is negatively charged |
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| Gain of one or more electrons by a neutral atom. Anion is negatively charged |
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| 2 bonds, 1 lone pair OR 2 bonds, 2 lone pairs |
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| When are electrons shared/attracted equally? |
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| when atoms are identical like H2 |
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| When are atoms not shared/attracted equally? |
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| when atoms are not identical, like HCl. known as polar covalent bond. |
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| T/F: Just because a molecule has polar covalent bonds does not mean that it's polar overall |
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