Question

Valency ,atomic no and symbol table of elements starting from atomic no. 21-scandium to atomic no. 40-zinc class 10

Answer 1

21 Scandium +3

22 Titanium +2, +3, +4

23 Vanadium +2, +3, +4, +5

24 Chromium +2, +3, +6

25 Manganese +2, (+3), +4, (+6), +7

26 Iron +2, +3, (+4), (+6)

27 Cobalt +2, +3, (+4)

28 Nickel (+1), +2, (+3), (+4)

29 Copper +1, +2, (+3)

30 Zinc +2

31 Gallium (+2). +3

32 Germanium -4, +2, +4

33 Arsenic -3, (+2), +3, +5

34 Selenium -2, (+2), +4, +6

35 Bromine -1, +1, (+3), (+4), +5

36 Krypton 0

37 Rubidium +1

38 Strontium +2

39 Yttrium +3

40 Zirconium (+2), (+3), +4

Answer 2

Explanation:

The upper person had answered correctly