When the size of elements increases down the group, what happens to the ionisation energy?

Remains the same

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Increase

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Decrease

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First Increases then decreases

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Solution

The correct option is C
Decrease

The size of the atoms increases down the group due to the addition of an extra shell. This results in the decrease of effective nuclear force between the electrons in the last shell and protons in the nucleus. Therefore, the ionisation energy decreases down the group.

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Similar questions

Assertion: The metallic character increases as we go down the group.

Reason: Increase in size decreases the ionisation energy.

Q. Ionisation energy increases across a period but decreases down a group.

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

(i) Electropositive nature of the element(s) increases down the group and decreases across the period
(ii) Electronegativity of the element decreases down the group and increases across the period
(iii) Atomic size increases down the group and decreases across a period (left to right)
(iv) 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.

Which is the element with the smallest atomic size

Q. Question 48 (b)
(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 most electronegative element.

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