Which of the following statements is incorrect regarding the valency of an element?
(a) Valency of alkali metals is 2
(b) Valency of group 18 elements is zero
(c) Valency of elements first increases till group 14 and then decreases across a period in the Modern periodic table.

Only (a)

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Only (c)

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Only (b)

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Both (a) and (c)

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Solution

The correct option is A Only (a)
The alkali metals have one electron in their valence shell. They can easily lose this electron to attain a noble gas configuration. Therefore, the valency of alkali metals is 1.
Hence, the correct answer is option (a).

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Similar questions

Q. What is the valency of the group 18 elements in the modern periodic table?

Q. Valency is equal to group number for all elements in the modern periodic table.

Q. If an element has valency 2 then the group of Modern Periodic Table to which this element belongs is

Write the number of periods the modern periodic table has. How do the valency and metallic character of elements vary on moving from left to right in a period? How do the valency and atomic size of elements vary down a group?

(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.

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Which of the following statements is incorrect regarding the valency of an element? (a) Valency of alkali metals is 2 (b) Valency of group 18 elements is zero (c) Valency of elements first increases till group 14 and then decreases across a period in the Modern periodic table.

The correct option is A Only (a)The alkali metals have one electron in their valence shell. They can easily lose this electron to attain a noble gas configuration. Therefore, the valency of alkali metals is 1. Hence, the correct answer is option (a).

Which of the following statements is incorrect regarding the valency of an element?
(a) Valency of alkali metals is 2
(b) Valency of group 18 elements is zero
(c) Valency of elements first increases till group 14 and then decreases across a period in the Modern periodic table.

The correct option is A Only (a)
The alkali metals have one electron in their valence shell. They can easily lose this electron to attain a noble gas configuration. Therefore, the valency of alkali metals is 1.
Hence, the correct answer is option (a).