
Introduction:
The atomic mass is determined as the average mass of its naturally occurring isotopes by keeping into account the relative abundance of each isotope. The atomic mass is also determined by the electrons and protons.

Answer to Problem 1RAC
The correct answer is option (e) atom.
Explanation of Solution
Explanation/justification for the correct answer:
Option (e) atom. An atom is the smallest particle of any element. The atom possesses the chemical characteristics of that element. For example, the element carbon is made up of only carbon atoms that consist of the atoms of one kind. So, the correct answer is option (e).
Explanation for incorrect answer:
Option (a) electron. The electrons are negative particles of an atom. It carries one negative charge. It moves around the nucleus in a specific orbit. So, this is an incorrect option.
Option (b) molecule. A molecule is two or more atoms chemically combined to form a structure which acts as an independent unit. So, this is an incorrect answer.
Option (c) neutron. The neutrons have no electrical charge. It is also present in the nucleus of an atom. So, this is an incorrect answer.
Option (d) proton. The protons are the positively charged particles of an atom. It carries one positive charge and present in the nucleus. So, this is an incorrect answer.
The smallest particle of an element that has the chemical characteristics of that element is an atom. Hence, the correct answer is option (e) atom.
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Chapter 2 Solutions
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