Atomic number Atomic mass.

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Presentation transcript:

Atomic number Atomic mass

protons electrons 2 2 1. Atomic number = number of __________ = number of _____________ So for Helium: electrons ____ protons _______ electrons 2 2

4 2 2 2. Mass = neutrons + protons Neutrons = mass – protons So for Helium: mass ______ - protons___ = neutrons _________ 4 2 2

2 3. Recap: Helium has _______ protons ________ neutrons ______ electrons 4. In the nucleus, let’s just write the number of protons and neutrons. 2 2 He 2 4 2p 2n

5. Now, add electrons to the first shell. 2 4 ---- 2p 2n ----

6. When protons = electrons, then it is a neutral atom. 7 6. When protons = electrons, then it is a neutral atom. 7. When MORE protons than electrons, it is a cation (positive ion). 8. When there are less protons than electrons, it is a anion (negative ion). 9. When there are different number of neutrons, it is an isotope.