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Standard X

Chemistry

Characteristics of s- Block Elements

Consider the ...

Question

Consider the following statements with reference to the periodic table of chemical elements
(a) Ionization potential gradually decreases along a period.
(b) In a group of elements, electron affinity decreases as the atomic weight increases.
(c) In a given period, electro-negativity decreases as the atomic number increases.
Which of these statements(s) is/are correct?

(a) only

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only

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(a) and (c)

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(b) and (c)

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Solution

The correct option is B only
Option: (b)

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Similar questions

Q. Identify the correct statements from the following.
(a) An element with low ionization potential has high electropositivity and hence give out electrons easily.
(b) Due to decrease in ionization energy, in a group, the oxidizing property decreases.
(c) Electronegativity decreases along a period due to increase in nuclear charge and increase in atomic size.
(d) Due to increase in electron affinity the reducing property increases along a period.

Q. Consider the following statements:
(a) Elements in a group have the same number of valence electrons.
(b) Variation of atomic size along a period shows an erratic behaviour towards the end.
(c) Electro-positive character decreases on moving down a group.
(d) Electro-negative in a period increases right from the alkali metal to the inert gas element.
Which of the above statement(s) is/are correct?

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.

(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. Which of the following sequence of explanation is appropriate for explaining the reason for the periodicity of reducing property in a period or group?
(a) Tendency to undergo oxidation decreases in a period and increases in a group.
(b) In a period ionization energy increases and in a group it decreases.
(c) In a period the atomic size decreases and in a group it increases.
(d) The elements present in the left side of the periodic table have strong reducing property.

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The correct option is B only Option: (b)

The correct option is B only
Option: (b)