Question

write the valancy of ammonium, lead , copper , aluminum , zinc , maganese , barium , copper and magnesium fast

please answer fast

Answer 1

ammonium -  1
lead  - 2 
copper -  1 , 2
aluminum - 3
zinc - 2
magnesium - 2
barium - 2

Answer 2

valencies of some elements:-
ammonium - 1
lead - 2
copper - 1,2
aluminium - 3
zinc - 2
magnesium - 2
barium - 2