Question

1st 20 elements with valency,atomic mass,atomic number,electrons

Answer 1

at. no. name. valency. electrons
1. H. 1. 1
2. He. 0. 2
3. Li. 1. 3
4. Be. 2. 4
5. B. 3. 5
6. C. 4. 6
7. N. 3. 7
8. O. 2. 8
9. F. 1. 9
10. Ne. 0. 10

similarly no.of electrons is equal to the atomic no.
and valency is the gain or loss of electrons .


thanks

Answer 2

Answer:

i attached document pls go through it    

• NOTE∵
• NUMBER OF ELECTRONS=NUMBER OF PROTONS=ATOMIC NUMBER

Explanation:

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