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

Question 15 Structure of the Atom - Exercise

In a sample of ethyl ethanoate (CH3COOC2H5) the two oxygen atoms have the same number of electrons but a different numbers of neutrons. Which of the following is the correct reason for it?

(a) One of the oxygen atoms has gained electrons

(b) One of the oxygen atoms has gained two neutrons

(c) The two oxygen atoms are isotopes

(d) The two oxygen atoms are isobars.

Answer:

The answer is(c) The two oxygen atoms are isotopes

Explanation:

Two Oxygen atoms in CH3COOC2H5 can have a different number of neutrons only if the two O-atoms are isotopes. Isotopes of an element have the same number of protons (and electrons) but a different number of neutrons.

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