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?

Only (a)

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Only (d)

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(b) and (c)

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(a) and (b)

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Solution

The correct option is D (a) and (b)
Groups have elements with similar configuration so elements in a group have same number of valency electrons.
Electropositive character increases on moving down a group. Electronegativity increases in a period but irregularly with exceptions. These exceptions are due greater stability of exactly fully filled and half filled configurations.

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Similar questions

Give scientific reasons:

1. Atomic size increases down the group.

2. Metallic character decreases from left to right in a period.

3. Elements in the same group show same valency.

Q. Question 48(e)
(a) Electropositive nature of the element(s) increases down the group and decreases across the period
(b) Electronegativity of the element decreases down the group and increases across the period
(c) Atomic size increases down the group and decreases across a period (left to right)
(d) 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.

Name the element which shows maximum valency.

(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.

Name the element which shows maximum valency.

Q. 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?

Choose the word or phrase from the brackets which correctly completes each of the following statements:-

(a) The element below sodium in the same group would be expected to have a ........... (lower/higher) electro-negativity than sodium and the element above chlorine would be expected to have a ............. (lower/higher) ionization potential than chlorine.

(b) On moving from left to right in a given period, the number of shells ...... (remains the same/ increases decreases).

(d) Metals are good ............. (oxidising agent/ reducing agent) because they are electron.......... (acceptors/donors).

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