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Q.

The atomic number and mass number of Lithium are 3 and 7 respectively, the number of protons and neutrons are:


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a

3 and 3 respectively

b

3 and 4 respectively

c

3 and 7 respectively

d

4 and 3 respectively 

answer is A.

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Detailed Solution

detailed_solution_thumbnail
The atomic number and mass number of Lithium are 3 and 7 respectively, the number of protons and neutrons are 3 and 4 respectively.
The formula for determining the number of neutrons = Mass number – Atomic number
 ⇒  7 – 3 = 4
The number of protons = the atomic number of the element
⇒ 3
 
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