Consider the following statements: I. There are 18 group and 8 periods in the periodic table. II. The valency of elements increases from 1 to 4 and then decreases to 0 on moving from left to right in a period. III. Atomic size, electropositive character, metallic character and basic nature of oxides decrease from left to right in a period. IV. In a period, electronegativity and electron affinity decreases from left to right. Which of these is/are correct?

II and III
I, III and IV
III and IV
I and IV

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 1 : II and III

The correct option is 1, i.e. II and III.

There are 18 groups and 7 periods in the periodic table. Hence, statement I is incorrect
The valency of elements increases from 1 to 4 and then decreases to 0 on moving from left to right in a period. Hence, statement II is correct.
Atomic size, electropositive character, metallic character and basic nature of oxides decrease from left to right in a period. Hence, statement III is correct.
In a period, electronegativity and electron affinity increase from left to right. Hence, statement IV is incorrect.
Valency - It is that property of an element that determines the number of other atoms with which an atom of the element can combine.
Electropositive implies having a tendency to lose electrons to form positive ions.
Electronegative implies having a tendency to gain electrons to form negative ions.
Electronegativity is a concept used to describe the tendency of an atom to attract electrons in a covalent bond.

4 views Answered 2022-09-04 04:29

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