i. Write the electronic conifigurations of the following ions:
a. `H^(Θ)`, b. `Na^(o+)`, c. `O^(2-)`, d. `F^(Θ)`
ii. What are the atomic numbers of elements whose outermost electrons are represented by
a. `3s^(1)`, b. `2p^(3)`, c. `3p^(5)`?
iii. Which atoms are indicated by the following configurations?
a. `[He]2s^(1)`, b. `[Ne]3s^(2) 3p^(3)`, c. `[Ar]4s^(2) 3d^(1)`

Explanation

(i) (a) `1s^(2), (b)1s^(2)2s^(2) 2p^(6) , (c) 1s^(2) 2s^(2)2p^(6), (d) 1s^(2)2s^(2)2p^(6)`.
(ii) (a) Na (Z=11) has outermost electronic configuration `=3s^(1)`
(b) N(Z=7)has outermost electronic configuration `=2p^(3)`
(c) Fe(Z=26)has outermost electronic configuration `=3d^(6)`
(iii) (a) Li (b) P (c) Sc