Given below are the melting points and the atomic radii of four elements P, Q, R and S each having n electrons in the outermost shell of their atoms. Which element will have the highest atomic number?
Element P Q R S
Melting Point $(^{\circ} C)$ 1.34 1.54 1.96 2.05
Atomic radius $(˚ A)$ 1.20 1.31 1.36 1.42

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Solution

The correct option is D S
Moving down the group the atomic radii increases as there are more filled energy levels,valence electrons are found farther from nucleus. So the atomic number increases down the group and the element with highest atomic radii will have highest atomic number. It is S.

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Similar questions

Q. Given below are the melting point and the atomic radii of three elements X, Y & Z each having an electron in the valence shell of their atom:

Element	X	Y	Z
M.P( $^{o} C$ )	1.54	1.96	1.34
ATOMIC RADIUS( $o A$ )	1.31	1.36	1.20

a) Will the valencies of the elements be the same or different? Why?
b) Which element will have the highest atomic number? Why?
c) Arrange the element in decreasing order of their metallic character.

Q. Atoms of two elements P and Q have 5 electrons in

2^{n d}

shell and

3^{r d}

shell respectively. What will be the atomic numbers of these elements?

Q. Which of the following elements will have same number of electrons in its outermost shell when compared to the element having atomic number 17.

Q. Atoms of two elements

P

and

Q

have

5

electrons in

2^{n d}

shell and

3^{r d}

shell respectively. What could be the geometric representations of

P

and

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There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The element which can exhibit covalency as well as electrovalency will be :

(a) P

(b) Q

(d) S

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Element	P	Q	R	S
Melting Point $(^{\circ} C)$	1.34	1.54	1.96	2.05
Atomic radius $(˚ A)$	1.20	1.31	1.36	1.42

Given below are the melting points and the atomic radii of four elements P, Q, R and S each having n electrons in the outermost shell of their atoms. Which element will have the highest atomic number?ElementPQRSMelting Point (∘C)1.341.541.962.05Atomic radius (˚A)1.201.311.361.42

The correct option is D SMoving down the group the atomic radii increases as there are more filled energy levels,valence electrons are found farther from nucleus. So the atomic number increases down the group and the element with highest atomic radii will have highest atomic number. It is S.

The correct option is D S
Moving down the group the atomic radii increases as there are more filled energy levels,valence electrons are found farther from nucleus. So the atomic number increases down the group and the element with highest atomic radii will have highest atomic number. It is S.