The pair of atoms having the same number of neutrons is(a) 126C, 2412M

1.	The pair of atoms having the same number of neutrons is(a) 126C, 2412Mg(b) 2311Na, 199F(c) 2311Na, 2412Mg(d) 2311Na, 3919K
Answer» Answer is : (c) ²³₁₁Na, ²⁴₁₂Mg Number of neutrons in the pairs given in options are as follows (a) ¹²₆C, ²⁴₁₂Mg No. of neutrons in C = 12 - 6 = 6 No. of neutrons in Mg = 24 - 12 = 12 (b) ²³₁₁Na, ¹⁹₉F No. of neutrons in Na = 23 - 11 = 12 No. of neutrons in F = 19 - 9 = 10 (c) ²³₁₁Na, ²⁴₁₂Mg No. of neutrons in Na = 23 - 11 = 12 No. of neutrons in Mg = 24 - 12 = 12 (d) ²³₁₁Na, ³⁹₁₉K No. of neutrons in Na = 23 - 11 = 12 No. of neutrons in K = 39 - 19 = 20 Thus, option (c) is correct.

The pair of atoms having the same number of neutrons is(a) 126C, 2412Mg(b) 2311Na, 199F(c) 2311Na, 2412Mg(d) 2311Na, 3919K

Answer»

Answer is : (c) ²³₁₁Na, ²⁴₁₂Mg

Number of neutrons in the pairs given in options are as follows

(a) ¹²₆C, ²⁴₁₂Mg

No. of neutrons in C = 12 - 6 = 6

No. of neutrons in Mg = 24 - 12 = 12

(b) ²³₁₁Na, ¹⁹₉F

No. of neutrons in Na = 23 - 11 = 12

No. of neutrons in F = 19 - 9 = 10

(c) ²³₁₁Na, ²⁴₁₂Mg

No. of neutrons in Na = 23 - 11 = 12

No. of neutrons in Mg = 24 - 12 = 12

(d) ²³₁₁Na, ³⁹₁₉K

No. of neutrons in Na = 23 - 11 = 12

No. of neutrons in K = 39 - 19 = 20

Thus, option (c) is correct.

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