Question

write the name and symbol of the lst 20 elements along with there atomic number, atomic mass, electronic configuration, velency and orbital structure

Answer 1

s /An /AM
1. Hydrogen - H/. 1/ 1
2. helium-. He/ 2./ 4.003
3. lithium -. Li. /3./ 6.94
4. beryllium-. Be/. 4./ 9.01
5. Boron -. B/. 5./ 10.81
6. Carbon-. C./ 6./ 12.01
7. nitrogen -. N./ 7. /14.01
8. Oxygen -. O. /8./ 15.99
9. Fluorine -. F./ 9 /18.99
10. Neon -. Ne/. 10. /20.18
11. sodium -. Na/. 11./ 22.99
12.magnesium - Mg/ 12./ 24.31
13. aluminum - Al./ 13./ 26.98
14. silicon -. Si./ 14./ 28.08
15.phosphorus - P/ 15./ 30.97
16. sulphur -. S./ 16./ 32.06
17. Chlorine - Cl/. 17./ 35.45
18. argon -. Ar./ 18 /39.95
19.potassium- K./ 19./ 39.1
20. calcium -. Ca./ 20./ 40.08

Answer 2

check from work book