Which of the elements having following positions,
have same number of valence electrons as that
of element with atomic number 6?
(i) Group 14 and period 5
(ii) Group 14 and period 4
(iii) Group 6 and period 4
(iv) Group 14 and period 3
A (i) and (ii) only
B (i), (ii) and (iii) only
C (i), (ii) and (iv) only
D All of these
this is wrong.. Cr- 3d5 4s1 has 6 valence electrons