NCERT Exemplar Solutions Class 9 Science Solutions for Structure of the Atom - Exercise in Chapter 4 - Structure of the Atom

Question 13 Structure of the Atom - Exercise

The ion of an element has 3 positive charges. The mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

(a) 13

(b) 10

(c) 14

(d) 16


The answer is (b) 10


Mass number (A) of the atom = 27

Number of the neutron in the atom =14

Number of Electrons=Mass number-Number of neutrons=27-14

Number of electrons= 13

Since ions of the element have 3 positive charges number of the electron in the ion is 13-3 which equals 10.

Hence the answer is 10

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