Examine the given electronic configurations.
A – 1s2 2s2 2p6 3s2 3p6 3d10 4s2
B – 1s2 2s2 2p6 3s1
C – 1s2 2s2 2p1 3s2 3p6
D – 1s2 2s2 2p6 3s2
E – 1s2 2s2 2p6 3s2 3p6 4s2
a. Which of these elements belongs to 4th period?
b. Which elements belongs to the same group ?
c. Which element doesn’t participate in chemical reactions generally ?
d. Which element has highest metallic character ?