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4

An atom of an element has electronic configuration (Ar) 4s23d5, the element belongs to block

A. s

B. p

C. f

D. d

Correct Answer :

D. d


Related Questions

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A metal may have atomic number

A. 85

B. 32

C. 38

D. 2

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O2-, FF-, Na+ and Mg2+ are isoelectronic, the order of increasing size is

A. F-<Na+g++<O2-

B. F-<O2-<Na+<Mg++

C. Mg++<F-<Na+<O2-

D. Mg++<Na+<F-<O2-

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4

The element with no definite place in the periodic table is

A. At

B. H

C. N

D. Pt

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4

Arrange the following set of atoms in the increasing order of electron affinity: F, Sr, Ge, Se

A. Ge, Se, Sr. F

B. Se, Ge. Sr. F

C. Sr, Ge. Se. F

D. F, Sr, Ge. Se

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4

Second electron affinity of the elements is always

A. positive

B. negative

C. zero

D. more than first E.A.

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4

Elements belonging to the same period are

A. Si, N, O

B. Li, Be, Mg

C. Sc. Ti. V

D. Cu, Zn, Cd

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4

Which of the following did not find a place in Mendeleef's periodic table?

A. Fr

B. Na

C. Ce

D. CI

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Which of the following has maximum ionisation energy ?

A. Li

B. Be

C. C

D. B

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4

IV Period has.........elements.

A. 18

B. 36

C. 8

D. 9

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4

In the Mendeleef's periodic table properties of the elements are the periodic function of their

A. atomic weight

B. atomic number

C. atomic volume

D. none of these

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4

Which of the following is not an s-block element?

A. Ru

B. Be

C. Fr

D. Rb

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4

The successive ionisation energies of an atom of an element A are:
900 kJ mole1, 1757 kJ mole-1, 14850 kJ mole-1 respectively. The element is most likely to be

A. B

B. Be

C. F

D. Ba

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With the increase in atomic number in a period of the periodic table

A. electron affinity decreases

B. metallic character decreases

C. ionisation energy decreases

D. atomic mass decreases

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4

The smallest ion amongst the following

A. Si+++1

B. K+

C. At1+1

D. Mg+1

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4

On moving across a period from left to right the ionisation energy increases because

A. value of principal quantum number increases

B. effective nuclear charge increases

C. atomic size increases

D. nuclear charge increases

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4

Arrange the following set of atoms in the order of increasing atomic radius : F, Cl, C, O

A. F, Cl, O, C

B. C. O, F, Cl

C. O. C, F, Cl

D. F, O, C, Cl

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4

The first atom with maximum number of d-electrons is with atomic number

A. 27

B. 46

C. 36

D. 29

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The heaviest element is

A. Cs

B. Na

C. Hg

D. U

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4

Elements whose atoms have incompletely filled penultimate energy levels are known as

A. s-block elements

B. p-block elements

C. d-block elements

D. inert gases

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4

In the periodic table on moving from left to right across a period, the metallic character of elements

A. increases

B. decreases

C. increases and decreases

D. remains the same

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4

The differentiating electron enters in the penultimate energy level in the case of

A. s block ele.

B. p block ele.

C. d block ele.

D. f block ele.

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4

An element A has atomic number 7. It will have properties similar to the element with atomic number

A. 85

B. 57

C. 26

D. 51

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4

Which of the following has minimum ionisation energy

A. Ca

B. In

C. Te

D. Rb

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4

Elements in the same vertical column has same

A. valence shell electronic configuration

B. electronic configuration

C. atomic number of isotopes

D. atomic size

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4

Which of the following have maximum size?

A. Cl

B. N2

C. F

D. Ne

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4

Which of the following has minimum ionisation energy?

A. F

B. Cl

C. Br

D. I

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4

An element has atomic number 2. It belongs to

A. O group

B. III A group

C. VI group

D. II B group

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4

The general electronic configuration of s-block elements is

A. ns1-2

B. ns2p6

C. ns1

D. ns0 to2

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4

Modem Periodic Law was given by

A. Joule

B. Moseley

C. Klechkosky

D. Meyer

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4

In C, N, O and F the electronegativity

A. decreases from C to F

B. decreases from C to O and then increases to F

C. increases from O to C and then decreases to F

D. increases from C to F