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Science Ch.1 Sec.2
Atoms, Bonding, and the Periodic Table
Term | Definition |
---|---|
alkali metals | an element belonging to group 1 of the veridic table, very reactive |
halogens | an element beloning to group 17of the periodic table, react easily with other elements whose atoms can give up or share electrons |
noble gas | an element of group 18 of the periodic table,they do not react easily with othe elements |
family | elements in the same vertical column of the periodic table also called a group |
group | elements in the same vertical column of the periodic table also called family |
period | elements in the same horizontal row of the periodic table |
symbol | a one or two letter set of characters that is used to identify an element |
atomic number | the number of protons in the nucleus of an atom |
chemical bond | the force that holds atom together |
electron dot diagram | a representation of the valence electron in an atom using dots,it includes the symbol for the element surrounded by dots |
valence electrons | the electrons that are the highest energy of an atom and that are invaded in chemical reactions |