Modern Physics 7 Question 52

58. How many electrons, protons and neutrons are there in a nucleus of atomic number 11 and mass number 24 ? Find,

(1982, 2M)

(a) Number of electrons.

(b) Number of protons.

(c) Number of neutrons.

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Answer:

Correct Answer: 58. Zero, 11,13

Solution:

  1. Number of proton $=$ atomic number $=11$

Number of neutron $=$ mass number - atomic number $=13$

But note that in the nucleus number of electrons will be zero.

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Paper 1

Section 1 (Maximum Marks : 12)

  • This section contains FOUR (04) questions
  • Each question has FOUR options. ONLY ONE of these four options is the correct answer.
  • For each question, choose the option corresponding to the correct answer.
  • Answer to each question will be evaluated according to the following marking scheme:
Full Marks

3 If ONLY the correct options is chosen.

Zero Marks

Negative Marks

0 If none of the options is chosen. (i.e., the question is unanswered)

-1 In all other cases.



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