Question

atomic number symbol mass element valency 20 to 40​

Answer 1

1. Atomic no. 20:potassium
2. Atomic no.21:calcium
3. Atomic no.22 :scandium
4. Atomic no.23:titanium
5. Atomic no.24:chromium
6. Atomic no.25:.magnesium
7. Atomic no.26:iron
8. Atomic no.27:cobalt
9. Atomic no.28:nickel
10. Atomic no.29:copper
11. Atomic no.30:zinc
12. Atomic no.31:gallium
13. Atomic no.32:germanium
14. Atomic.no.33:arsenic
15. Atomic no.34:selenium
16. Atomic no.35:bromine
17. Atomic no.36:krypton
18. Atomic no.37:rubidium
19. Atomic no.38:strontium
20. Atomic no.39:yttrium
21. Atomic no.40:zirconium.