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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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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.

(c) The ionization potential :

(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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