Question

2) A student learns that atomic size depends on the atomic radius of the elements. How does the atomic radius of elements in third-period change as one goes from sodium to argon? *
a) Atomic radius increases from sodium to argon
b) Atomic radius decreases from sodium to argon
c) Atomic radius increases as new shells are added
d) Atomic radius decreases due to the addition of new shells​

Answer 1

Explanation:

option c

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Answer 2

• By observing the periodic table we can observe that atomic radius is dependent on the atomic radius.
• An atom has shells K, L, M, N, etc. that accommodate electrons in them.
• In all the atoms of the third period, the K shell and L shell are filled with electrons. The new electrons will be added to the M shell.
• However, the addition of electrons in the M shell will also result in the addition of protons in the nucleus.
• The nuclear charge of the atom will increase which causes the attraction of electrons towards the nucleus. This results in tighter nuclear forces.
• Therefore the atoms on the left will have less nuclear charge and hence will have a larger size as compared to atoms on the right.
• Hence the atomic radius decreases from sodium to argon in the third period.