Question

cine ma poate ajuta repede ofer steluță ​si coroana +grad

Answer 1

a.

1s2 2s2 2p4

=> Z = 2+2+4 = 8

b.

1s2 2s2 2p6 3s1

=> Z = 2+2+6+1 = 11

c.

1s2 2s2 2p6 3s2 3p3

=> Z = 2+2+6+2+3 = 15

d.

K2e- L8e- M8e-

=> Z = 2+8+8 = 18

e.

1s2 2s2 2p6 2s2

=> Z = 2+2+6+2 = 12

f.

1s2 2s2 2p6 3s2 3p6

=> Z = 2+2+6+2+6 = 18