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Variation of Metallic Properties

Why metallic ...

Question

Why metallic character decreases across a period and increases down a group?

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Solution

As the effective nuclear charge acting on the valence shell electrons increases across a period, the tendency to lose electrons will decrease. [1 Mark]

Down the group, the effective nuclear charge experienced by valence electrons decreases because the outermost electrons move farther away from the nucleus. Therefore, these can be lost easily. [1 Mark]

Hence metallic character decreases across a period and increases down a group.

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Q. Question 48 (b)
(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 most electronegative element.

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.

Q. Non mettalic character increase across the peroid while it decreases down the group . comment.

Q. The metallic character decreases down the group and increases along the period.

Q. Assertion :Electronegativity across a period increases and down the group decreases. Reason: As we move down the group, basic character increases while as we move across a period its acidic character increases

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