Nuclei - Result Question 17
19. In the nucleus of $ _{11} Na^{23}$, the number of protons, neutrons and electrons are
(a) $11,12,0$
(b) $23,12,11$
(c) $12,11,0$
(d) $23,11,12$
[1991]
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Answer:
Correct Answer: 19. (a)
Solution:
- (a) $Z=11$ i.e., number of protons $=11, A=23$
$\therefore$ Number of neutrons $=A-Z=12$
Number of electron $=0$ (No electron in nucleus) Therefore 11, 12, 0 .
