Question
Which of the following pairs of 'number – composition' is correct? I. Atomic number – number of protons II. Mass number – Sum of number of neutrons and protons
The correct answer is
Both I and II
Atomic number is the number of protons in the nucleus. Mass number is the total number of protons and neutrons, so both statements are correct.
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Important Questions from Atomic Structure
- The correct statement(s) about $^4D_{5/2}$ state of an atom is (are):
- The value of the magnetic quantum number of a $p_x$ orbital is
N atom has 3 unpaired electrons because of
Which one among the following statements is not true for glass?
- The two isotopes of elemental chlorine are :
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