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Physical Properties of Boron Family

Melting point...

Question

Melting point of d block elements across a period:

A

Does not change on moving from left to right.

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B

Increases from left to right

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C

Increases to a maximum at d⁵ and then decreases with increase of atomic number.

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D

Deceases from left to right

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Solution

The correct option is C
Increases to a maximum at d⁵ and then decreases with increase of atomic number.

Melting point of transition elements increases to a maximum at d⁵ and then decreases with increase of atomic number across a period.

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Q. On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?

(a) increases
(b) decreases
(c) remain the same
(d) first increases then decreases

The density of elements of 3d series across a period:

Q. The electron affinity increases on moving from left to right along a period. Arrange the reasons in a proper sequence.
(a) The amount of energy released during the addition of an electrons increases from left to right along a period.
(b) Effective nuclear charge of the elements increases from left to right.
(c) The atomic size of the elements decreases from left to right.
(d) The tendency to gain electrons and form anion increases from left to right.

Q. Question 25
On moving from left to right in a period in the periodic table, the size of the atom.

(a) increases
(b) decreases
(c) does not change appreciably
(d) first decreases and then increases

Assertion: The atomic radius decreases as we move from left to right in a period.

Reason: Effective nuclear charge increases across the period from left to right.

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