Biology 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0-07802-426-9
ISBN 13: 978-0-07802-426-9

Chapter 2 - Basic Chemistry - Assess: 1


Correct option is (e) Both b and d are correct

Work Step by Step

Atomic number is the total number of protons present in the nucleus. It is represented by letter Z. Each atom has its own mass number which depends on the number of subatomic particles in the atom. Positive charges of protons of an atom balance the negative charge of its electrons. Thus in a neutral atom number of protons is equal to the number of electrons. Hence, the atomic number tells us about the number of protons in the nucleus and the number of an electron revolving around the nucleus. Therefore, both the options (b) and (d) are correct. The number of neutrons present in the nucleus is obtained by removing the atomic number from the mass number. Therefore, the option a is incorrect. The atomic mass is the total weight of protons and neutrons present in the nucleus. It is not given with the atomic number. Therefore, the option c is incorrect.
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