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| First two elements formed? |
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| organic compounds were only those that came from living organisms, and only living things could synthesize organic compounds through intervention of a vital force |
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| atoms that have the same number of protons in their nuclei but have differing atomic masses because their nuclei have different numbers of neutrons |
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| different molecules that have the same molecular formula |
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| Define constitutional isomers? |
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Definition
| different compounds that have the same molecular formula but differ in the sequence to which their atoms are bonded |
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| How are ionic bonds formed? |
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Definition
| by the transfer of one or more electrons from one atom to another |
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| How are covalent bonds formed? |
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Definition
| by sharing of electrons between atom of similar electronegativities to ahieve the configuration of a noble gas |
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| the tendency for an atom to achieve a configuration where its valence shell contains eight electrons |
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| an attractive force between oppositely charged ions |
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| Definite electronegativity? |
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Definition
| a measure of the ability of an atom to attract electrons |
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| Molecules are composed of atoms joined exclusively or predominantly by what type of bond? |
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