Which of the following is true regarding the trend in atomic size?

For d block elements, there is a regular increase in atomic radius as we move from left to right across the periodic table for the first transition series

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As we move down the group 13, there is a regular increase in atomic radius

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Atomic radius of Ne is greater than that of F

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All of the above

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Solution

The correct option is C Atomic radius of Ne is greater than that of F
a) Since, d electrons in the inner shell are filled, there is significant increase in the screening effect. It decreases from Sc to Cr and then remains constant until Cu and then increases again.

b) Due to poor shielding of d electrons, Ga has slightly smaller atomic radius than Al.

c) Since Ne has van der waals radius which is greater than the covalent radius, Ne has higher atomic radius than F.
Hence, C is the right answer.

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Q. Statement I: Atomic radius generally increases as you move across the periodic table from left to right.
Statement II: The atomic number is increasing from left to right as you move across the periodic table.

(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

$(a)$ The 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.

Based on the above trends of the periodic table, answer the following about the elements with atomic numbers $3$ to $9$ . Name the element with the smallest atomic size.

$(a)$ 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.

Based on 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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