Question 17

The electronic configurations of the elements A, B and C are given below. Answer the question on the basis of these configurations.

A $1 s^{2}$ $2 s^{2}$ $2 p^{6}$

B $1 s^{2}$ $2 s^{2}$ $2 p^{6}$ $3 s^{2}$ $3 p^{3}$

C $1 s^{2}$ $2 p^{6}$ $2 p^{6}$ $3 s^{2}$ $3 p^{5}$

The bond between B and C will be

(a) ionic

(b) covalent

(c) hydrogen

(d) coordinate

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Solution

Answer: (b) covalent

B represents Phosphorus and C represents Chlorine. The bond between B and C will be covalent. Both B and C are non-metal atoms.

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Question 16

The electronic configurations of the elements A, B and C are given below. Answer the question on the basis of these configurations.

A $1 s^{2}$ $2 s^{2}$ $2 p^{6}$

B $1 s^{2}$ $2 s^{2}$ $2 p^{6}$ $3 s^{2}$ $3 p^{3}$

C $1 s^{2}$ $2 p^{6}$ $2 p^{6}$ $3 s^{2}$ $3 p^{5}$

The molecular formula of the compound formed from B and C will be

(a) BC

(b) $B_{2} C$

(d) $B C_{3}$

Q. The electronic configurations of three elements A, B and C are as follows:

A	2, 8, 1
B	2, 8, 7
C	2, 4

(a) Which of these element is a metal?
(b) Which of these elements are non-metals?
(c) Which two elements will combine to form an ionic bond?
(d) Which two elements will combine to form a covalent bond?
(e) Which element will form an anion of valency 1?

Q. Electronic configurations of four elements

A, B, C

and

D

are given below:
(A)

1 s^{2} 2 s^{2} 2 p^{6}

(B)

1 s^{2} 2 s^{2} 2 p^{4}

(C)

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

(D)

1 s^{2} 2 s^{2} 2 p^{5}

Which of the following is the correct order of increasing tendency to gain electron?

Q. Question 37

Identify and name the metals out of the following elements whose electronic configurations are given below.

(a) 2, 8, 2
(b) 2, 8, 1
(c) 2, 8, 7
(d) 2, 1

Electronic configuration of four elements A, B, C, and D are given below
A. $1 s^{2} 2 s^{2} 2 p^{6}$ B. $1 s^{2} 2 s^{2} 2 p^{4}$ C. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$
D. $1 s^{2} 2 s^{2} 2 p^{5}$
Whilch of the following is the correct order of increasing tendency to gain electron?
(a) A < C <B <D (b) A < B < C < D (c) D <B < C < A (d) D < A < B <C

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Question 17 The electronic configurations of the elements A, B and C are given below. Answer the question on the basis of these configurations. A 1s2 2s2 2p6 B 1s2 2s2 2p6 3s2 3p3 C 1s2 2p6 2p6 3s2 3p5 The bond between B and C will be (a) ionic (b) covalent (c) hydrogen (d) coordinate

Answer: (b) covalent B represents Phosphorus and C represents Chlorine. The bond between B and C will be covalent. Both B and C are non-metal atoms.

Answer: (b) covalent

B represents Phosphorus and C represents Chlorine. The bond between B and C will be covalent. Both B and C are non-metal atoms.