Question

Z
8
10
y=
51
O
39
O 37

Answer 1

erylium Be Z=4, A=10 ... Oxygen O Z=8, A=16 ... Vanadium Va Z=23, A=51 Rubidium Rb Z=37, A=85.5. Strontium Sr Z=38, A=88. Yttrium Y Z=39, A=89

Explanation: