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Chem Test Ch 9, 10
Chemistry Test Chapter 9,10
| Term | Definition |
|---|---|
| alkali metals | group 1 and most reactive metal on the periodic table |
| alkaline earth metals | group 2 and is a valence electron |
| group | a column on the periodic table |
| metals | an element that is shiny, easily pulled into wires or hammered into thin sheets, and a good conductor of electricity and thermal energy |
| period | a row on the periodic table |
| transition elements | an element in groups 3-12 on the periodic table |
| noble gases | least reactive gas and is in group 18 |
| atom | a small particle that is the building block of matter, and is the smallest piece of an element that still represents that element |
| atomic number | the number of protons in an atom of an element |
| atomic mass | amount of mass in an object |
| ion | an atom that is no longer neutral because it has lost or gained valence electrons |
| neutron | a neutral particle in the nucleus of an atom |
| average atomic mass | the average mass of the element's isotopes, and is weighted according to the abundance of each isotope |
| iosotopes | atoms of the same element that have different numbers of neutrons |
| nucleus | the region in the center of an atom where most of an atom's mass and positive charge are concentrated |
| elements | a substance that consists of only one type of atom |
| protons | positively charged particle in the nucleus of an atom |
| radioactivity | any element that spontaneously emits radiation |
| electrons | a negatively charged particle that occupies the space in an atom outside the nucleus |
Created by:
2018grellerj
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