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Standard XII

Chemistry

Ionization Energies

Give the reas...

Question

Give the reasons for the following :

(iii) Ionization potential of the element increases across a period.

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Solution

Due to an increase in the nuclear charge, the atomic size decreases from left to right in a period.

Thus, the electrons are strongly attracted by the nucleus and more energy is needed to remove an electron from the atom.

Therefore, the ionization potential of the element increases across a period.

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Similar questions

Parts (a) to (e) refer to changes in the properties of elements on moving from left to right across a period of Periodic Table. For each property, choose the correct answer.

(a) The non-metallic character of the elements :

(i) decreases, (ii) increases,

(iii) remains the same, (iv) depends on the period

(b) The electronegativity :

(i) depends on the number of valence electrons,

(ii) remains the same,

(iii) decreases,

(iv) increases.

(i) goes up and down (ii) decreases

(iii) increases (iv) remains the same

(d) The atomic size :

(i) decreases,

(ii) increases,

(iii) remains the same ,

(iv) sometimes increases and sometimes decreases.

(e) The electron affinity of the elements in groups 1 to 7 :

(i) goes up and then down.

(ii) decreases and then increases,

(iii) increases,

(iv) decreases.

Give reason for the following.
Ionisation potential of the element increases across a period.

Q. Give reason:
(i) Ionization potential increases across a period

Q. Give reasons for the following:
Ionisation potential of element increases across a period.

Q. Assertion :Ionisation potential increases with increase in nuclear charge of the elements. Reason: Ionization energies increase moving from left to right across a period.

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Ionization Energies

Standard XII Chemistry

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Give the reasons for the following : (iii) Ionization potential of the element increases across a period.

Due to an increase in the nuclear charge, the atomic size decreases from left to right in a period. Thus, the electrons are strongly attracted by the nucleus and more energy is needed to remove an electron from the atom. Therefore, the ionization potential of the element increases across a period.

Give the reasons for the following :

(iii) Ionization potential of the element increases across a period.