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| 14 elements with atomic numbers 58 to 71 |
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| 14 elements with atomic numbers form 90 to 103 |
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| Rare Earth Elements/ INner-Transition Elements (f-block) |
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Definition
| 28 elements in the lathaninde and actinide periods they are shiny metal that are too reactive to be found as free elements; all are radioactive |
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| physical and chemical properties of the elements are periodic functions of their atomic number |
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| arrangement of elements in order of their atomic numbers so that elements with similar properties fall in the same column |
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| elements in group 1 al have silvery appearance and are soft; very reactive so not ofuond on earth as free elements |
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| elements in group 2 harder and more dense than group 1 but still are very reactive and not found on earth as free elements |
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| group 17 most reactive non-metals |
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Definition
| p-block and s-block elements |
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| a negative ion formed by the addition of one or more electrons leads to an increase in atomic radius |
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| one-half the distance between the nucleus' of two identical atoms that are bonded |
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| a positive ion formed by the loss of one or more electron |
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| energy change that occurs when an electron is gained by a neutral atom |
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| measure of the ability of an atom in a chemical compound to attract electrons form another atom in the compound |
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| atom or group of nonded atoms that have a positive or negative charge |
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Definition
| any process that results in the formation of an ion |
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| energy required to remove one electron form a neutral atom |
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| electron available to be lost gained or shared int he formation of chemical compounds |
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Definition
| mutual electrical attraction between the nuclui and valence electrons of different atoms that bind the atoms together |
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Term
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Definition
| results from the sharing of electon pairs between two atoms |
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Definition
| chemical bonding that results from the electrical attraction between cations and anion |
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Definition
| bonding electrons are shared equally by the bonded atoms results in a balanced distribution of electrical charge |
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| uneven distribution of charge |
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Definition
| covalent bonded atoms have an unequal attraction for the shared electrons |
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| energy required to break a chemical bonds and form neutral isolated atoms |
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| two bonded atoms at their minimum PE or the average distance between two bonded atoms |
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Definition
| covalent bond in which two pairs of electrons are shared between two atoms |
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Term
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Definition
| chemical compounds tend to forms so that by gaining, losing, or sharing, an electron it has an octet of electrons in its highest occupied energy level |
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Definition
| composed of positive and negative ions that are combined so that the numbers if positve and negative charges are equal |
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| intermolecular attractions resulting from the constant motions of electrons and the creation of instaneous dipoles |
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| staes that repulsion between the sets of valence-level electrons surronding an atom causes these sets to be oriented as far apart as possible |
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