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15. 3
16. a group of atoms carrying charge is known as
ion
types anion and cation
ex. NH4+
17. sodium atom is not constant
and sodium ion losses one electron so it is cobstant
19.3:8
20. 84amu
21. 8
23. 18
24 m=11. atomic no. 5
'v. e=3. electron=5
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