Introduction:
Atoms are called as the smallest unit of an element, which retains its physical as well as the chemical properties of the element. It is the smallest unit that can enter into any
Answer to Problem 1A
Correct answer:
The atomic number provides the number of protons in a nucleus. Therefore, option (b) is correct
Explanation of Solution
Reasons for the correct statement:
In an element, all the atoms of the nucleus possess same number of the protons. This is known as the atomic number. Thus, this forms the unique property of a particular element
Option (b) is given as “number of protons in the nucleus”
“The atomic number gives the number of protons in the nucleus”, it is the right answer”
Hence, option (b) is correct
Reasons for the incorrect statements:
Option (a) is given as “number of neutrons in the nucleus”.
Atomic number is not the number of neutrons in the nucleus; instead it consists of the number of protons. So, it is a wrong answer
Option (c) is given as “weight of the atom”.
Weight of an atom is based on the number of atoms or number of particles that are present in 1 mole of an atom. It does not mean the atomic number. So, it is a wrong answer
Option (d) is given as “number of protons in the valence shell”.
The valence shell of an atom comprises of electrons. It does not mean the atomic number. So, it is a wrong answer
Hence, options (a), (c) and (d) are incorrect
The atomic number provides the number of protons in a nucleus
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Chapter 2 Solutions
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