On moving from left to right across a period, the atomic size ______.

Increases

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Decreases

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Remains constant

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No trend observed

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Solution

The correct option is B
Decreases

The atomic radius is the distance from the atomic nucleus to the outermost stable electron orbit of a neutral atom.

The atomic size tends to decrease across a period from left to right because of increased attraction between the valence shell electrons and the nucleus, because of increasing number of protons.

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Similar questions

Q. On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?

(a) increases
(b) decreases
(c) remain the same
(d) first increases then decreases

Question 48 (c)
(a) Electropositive nature of the element(s) increases down the group and decreases across the period
(b) Electronegativity of the element decreases down the group and increases across the period
(c) Atomic size increases down the group and decreases across a period (left to right)
(d) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

Name the element with smallest atomic size.

The density of elements of 3d series across a period:

Assertion: The atomic radius decreases as we move from left to right in a period.

Reason: Effective nuclear charge increases across the period from left to right.

Q. Assertion :Atomic size decreases across period but increases down a group of the periodic table. Reason: Moving from left to right across a period, electrons are added one at a time to the outer energy shell. Electrons within a shell cannot shield each other from the attraction to protons, while moving down a group in the periodic table, the number of electrons and filled electron shells increases.

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