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Unit 2- Chemistry
Unit Test
Term | Definition |
---|---|
atomic number | the number of protons contained in an atom of an element |
Periodic Table | a chart that shows all of the elements arranged by increasing atomic numbers and by properties |
group | A column on the periodic table |
period | A row on the periodic table |
element | A pure substance made of only one kind of atom |
chemical symbol | an abbreviation for the element's name |
proton | larger particles that have a positive charge and can be found in the nucleus |
neutron | larger particles that have a neutral charge and can be found in the nucleus |
electron | smaller particles that have a negative charge and can be found on the outer shells |
atom | smallest part of an element; called the "building blocks" of matter |
compound | A pure substance that contains atoms of different elements. |
chemical bonds | The lines that connect atoms to make molecules |
molecule | Any atoms that are connected by chemical bonds are called this |