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Anh Khoa
1-D
2-G
3-I
4-A
5-C
6-F
7-B

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•Pt have 78 Protons, 78 Electrons and 117 Neutrons
•Ar have 18 Protons, 18 Electrons and 22 Neutrons
•Co have 27 Protons, 27 Electrons and 32 Neutrons
•Li have 3 Protons, 3 Electrons and 4 Neutrons
•B have 5 Protons, 5 Electrons and 6 Neutrons

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Refer to the elements listed below: 1..., 2..., 3....

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A) 20,10 Ne have 10 protons, 10 electrons and 10 neutrons
22,10 Ne have 10 protons, 10 electrons and 12 neutrons
B) Tha atomic mass of any atom of a particular element is not always the same
C) True
D) Group 1 elements readily form positive ions