7. Which of the following atoms has three unpaired electrons? A) Al B) o C) N D)

Question

7. Which of the following atoms has three unpaired electrons? A) Al B) o C) N D) S E) C S. Consider the following electron arrangements. Which represents for N? b) c) d) e) A) option a B) option b C) option c D) option d E) optione 9. Specify the group of the periodic table in which each of the following elements is found (a) [Ne]3s', (b) [Ne]3s 3p. (c) [Ne]3s 3ps, A) Group 1A, 5A, 8A B) Group 2A, 3A, 8A C) Group 2A, 4A, 8A D) Group 2A, 5A, 8A E) Group 1A, 3A, 6A 10. Which of the following atoms has the electron configuration as [Ar] 4ddn A) Sc B) V C) Fe D) Co E) Zn

Explanation / Answer

7)

option C) N is the answer.

N have 2s2 2p3 valence shell. so 2p contains three unpaired electrons.

8)

Valence shell electron configuration of N is 2s2 2p3.

Hence option A is the answer.

9)

a) contains two s electrons. so group 2A.

b) contains 4 valence electrons. so group 4A.

c) contains 8 valence electrons. so group 8A.

option C is the answer.

10)

its have six 3d electrons.

Hence option C) Fe is the answer.

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