Question

how to find valancies of 1 phosphorus 2 chlorine 3 potassium 4 magnesium 5 zinc

Answer 1

the atomic no. of phosphorus is 15= 2,8,5
the valancy of phosphorus is 5-8=-3
the atomic no of chlorine is 17=2,8,7
the valancy of chlorine is 7-8=-1
the atomic no of potassium is 19=2,8,8,1
the valancy of potassium is 1
the atomic no of magnesium is 12=2,8,2
the valancy of magnesium is=2
the atomic no of zinc is 30=2,8,8,8,4
the valancy of zinc is=4