Question

write the atomic nuber of two elements x and y having electronic configuration 2,8,2 and 2,8,6​

Answer 1

2,8,2 = 6 ( carbon )

2,8,6 = 8 ( oxygen )

Answer 2

atomic no. of x = no. of protons = no. of electrons

no. of electrons = 2+8+2 = 12

therefore , atomic no. of x = 12

atomic no. of y = no. of protons = no. of electrons

no. of electrons = 2+8+6= 16

therefore , atomic no. of y = 16

hope it helps