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Question

Which of the following are not stable?
(i) $$_{6}^{14}{C}$$
(ii) $$_{6}^{13}{C}$$
(iii) $$_{7}^{14}{N}$$
(iv) $$_{11}^{24}{Na}$$


A
(i) 146C, (ii) 136C, (iv) 2411Na
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B
(i) 146C, (ii) 136C, (iii) 147N
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C
(i) 146C, (iii) 147N, (iv) 2411Na
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D
None of these
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Solution

The correct option is A (i) $$_{6}^{14}{C}$$, (ii) $$_{6}^{13}{C}$$, (iv) $$_{11}^{24}{Na}$$
An unstable isotope undergoes radioactive decay meaning it looses energy over time while emitting radiation.

Carbon-14 atoms have two extra neutrons, giving them a total of 8 neutrons. Carbon-14 has an atomic mass of 14 ( = 6 protons + 8 neutrons). The extra neutrons make the nucleus of carbon-14 unstable.
C-13 is relatively stable than C-12 but not as stable as C-12.

Also Na-24 is unstable and undergoes radioactive decay giving Mg.

Chemistry
NCERT
Standard XII

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