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Modern Periodic Table

Atomic radius...

Question

Atomic radius of which element has the least value in $2^{n d}$ period ?

A

Hydrogen

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B

Florine

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C

Neon

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D

Helium

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Solution

The correct option is B Florine
As we move from left to right, atomic size decreases because of increase in nuclear charge but no change in the shells. Hence, Last element will be the smallest element in the period. Hence, fluorine has small radius in the second period. Noble gases are exception to this property.

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Similar questions

Q. Assertion :Neon has the least atomic radius in 2nd period. Reason: In a period, atomic radius decreases from left to right.

Q. Which of the following elements has the least atomic radius?

Q. Among the elements of the second period pick out the element which has a smallest atomic radius.

Q. (a) Explain why, the first period of the modern periodic table has only two elements whereas second period has eight elements
(b) Why do elements in the same group show similar properties but the elements in different groups show different properties?
(c) For each of the following triads, name the element with the characteristics specified below:

Elements	Least atomic radius	Chemically least reactive
(i) F, Cl, Br (ii) Li, Na, K	.................... ....................	.................... ....................

(d) State one reason for keeping fluorine and chlorine in the same group of the periodic table.
(e) What are the merits of the modern periodic table of elements?

Q. An atom has the symbol

_{q}^{p} X

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Which value determines the position of the element in the periodic table?

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