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Ionization Energies

Select the co...

Question

Select the correct answer-
(i) Across a period, the ionization potential _______ [increases, decreases, remains same]

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Solution

Across a period, the ionization potential $i n c r e a s e s - --------- -$ .
$∙$ Since atomic size decreases and nuclear charge increases across the period.
$∙$ Thus, the ionisation potential increases as more energy will be required to remove electron.

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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.

(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.

Q. State whether the ionization potential increases or decreases on going down a group.

Q. Fill in the blanks from the choices given below:
(i) Across a period, the ionisation potential __________ (increases, decreases, remains same).
(ii) Down the group, electron affinity _________ (increases, decreases, remains same).

Q. Part (i) to (v) refer to changes in the properties of elements on moving from left to right across a period of the periodic table. For each property, choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d).
(i) The non-metallic character of the elements:
(a) decreases
(b) increases
(c) remains the same
(d) depends on the period

(ii) The electronegativity:
(a) depends on the number of valence electrons
(b) remains the same
(c) decreases
(d) increases

(iii) The ionisation potential:
(a) goes up and down
(b) decreases
(c) increases
(d) remains the same

(iv) The atomic size:
(a) decreases
(b) increases
(c) remains the same
(d) sometimes increases and sometimes decreases

(v) The electron affinity of the elements in groups 1 to 7:
(a) goes up and then down
(b) decreases and then increases
(c) increases
(d) decreases

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

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Ionization Energies

Standard XI Chemistry

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