Question

Predict the periods and blocks to which each of the following elements belong?

(i) ₁₂Mg

(ii) ₂₆Fe

(iii) ₂₉Cu

(iv) ₁₃Al

Answer 1

(i) ₁₂Mg = 2, 8,2 = 1s² , 2s²2p⁶ , 3s² It belongs to 3rd period and s-block.

(ii) ₂₆Fe = 2, 8, 14, 2 = 1s₂ , 2s²2p⁶ , 3s² , 3s² , 3p⁶ 3d⁶ , 4s² It belongs to 4th period and dblock.

(iii) ₂₉Cu = 2,8,18,1 = 1s² , 2s²2p⁶ , 3s²3s⁶3^d6 , 4s¹ It belong to 4th period and d-block

(iv) ₁₃Al = 2, 8, 3 = 1s² , 2s²2p⁶ , 3s² , 3p¹ It belongs to 3rd period and p-block.