Answered: When an unstable nucleus decays by…

When an unstable nucleus decays by emitting an alpha particle, the atomic mass number of the nucleus decreases by 2. O remains unchanged. decreases by 4. O increases by 4. increases by 2.

Modern Physics

3rd Edition

ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter13: Nuclear Structure

Section: Chapter Questions

Problem 19Q

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Question

I got this question wrong and I don't know why.

When an unstable nucleus decays by emitting an alpha particle, the atomic mass number of the nucleus
O decreases by 2.
remains unchanged.
decreases by 4.
O increases by 4.
O increases by 2.

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