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matts science 2

Mass # The sum of the number of neutrons and protons in an atomic nucleus
Valence electrons An electron in an outer shell of an atom that can participate in forming chemical bonds with other atoms
isotopes one of two or more atoms with the same number of protons in the nucleus but a different number of neutrons
Lanthanides and actinides bottom of the peridic table actinides are below Lanthanides.
1st energy level, how many electrons can it hold? 2
second energy level, how many electrons can it hold? 8
What is the importance of the zigzag line? difference between the metals and non metals
Created by: mktmac