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Periods in Modern Periodic Table

On moving fro...

Question

On moving from left to right in a period in the periodic table, the size of the atom.

A

Increases

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B

Decreases

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C

Does not change appreciably

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D

First decreases and then increases

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Solution

The correct option is B Decreases
In a period, the size of an atom decreases from left to right. This is because the nuclear charge, that is, the atomic number increases from left to right in the same period, thereby bringing the outermost shell closer to the nucleus.

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Q. Question 25
On moving from left to right in a period in the periodic table, the size of the atom.

(a) increases
(b) decreases
(c) does not change appreciably
(d) first decreases and then increases

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

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

Q. Assertion :Atomic size decreases in a period due to increase of atomic number. Reason: The nuclear charge is increasing and size of valence shell remains same as we move from left to right. Hence, in any period, the atomic size of the element decreases 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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Periods in Modern Periodic Table

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