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Standard XI

Chemistry

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.

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

Across a period, the ionization potential increases–––––––––––. ∙ 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.

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

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.