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Periods in Modern Periodic Table

In the period...

Question

In the periodic table of the elements in a period from left to right atomic radius increases or decreases?

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Solution

Atomicsize gradually decreases from left to right across a period of elements. This is because, within a period or family ofelements, all electrons are added to the same shell. ... The valence electrons are held closer towards the nucleus of the atom.

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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 ?

In the periodic table, the atomic radius increases from left to right.

The number of protons is increasing from left to right.

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.

Explain the following
(i) Electronegativity of elements increase on moving from left to right in the periodic table.

(ii) Ionisation enthalpy decreases in a group from top to bottom.

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