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Chemistry Notes
Term | Definition |
---|---|
Element | made of one kind of atom. It can't be broken down during a chemical reaction. It combines with other elements to form compounds. |
Symbol | the abbreviation for the element. Always a capital letter, or a capital and a lower case. |
Atomic Mass | decimal number below the symbol. It is the mass of the protons and neutrons in an element |
Atomic Number | located above the symbol Tells the number of protons in the nucleus of an atom. |
Group | vertical column of elements on the periodic tables. These element have similar properties. |
Period | elements in a horizontal line on the periodic table. These elements all have the same number of electron levels (valence) |
Mass Number | number of protons and neutrons in the nucleus of an atom. It is the atomic mass rounded to the nearest whole number |