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4

The atomic structure of an atom of an element is Is 1s2, 2s22p6, 3s23p6. The element is

A. Cl-35

B. S-32

C. N-18

D. O-16

Correct Answer :

A. Cl-35


Related Questions

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Which elements is represented by the following electronic configuration?

A. Nitrogen

B. Oxygen

C. Fluorine

D. Neon

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The charge on an atom of A1327l is

A. +40

B. +27

C. +14

D. Zero

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4

In Lyman series an electron jumps from higher energy level to

A. K energy level

B. M energy level

C. N energy level

D. L energy level

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4

The number of unpaired electrons in fluorine atoms is/are

A. 4

B. 2

C. 1

D. 0

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4

Which of the following weighs the least?

A. 1 g of CO2

B. 2 litres of CO2 at N.T.P.

C. 3.01×1011 molecules of CO2

D. 3.01×1022 atoms of carbon

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4

If value of h is taken as 10-34 kg m2 sec-1, the de-Broglie wavelength of a particle of mass 10-31 having velocity 109cm sec-1 is

A. 0.01 m

B. 2 nm

C. 0.1 nm

D. 15Å

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4

The fundamental particle that has least mass is

A. meson

B. alpha-particle

C. electron

D. neutron

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The wavelength of an electron moving with a velocity 5×105m sec-1 is (h=6.63 ×10-34 kg m2 sec-1) 

A. 11.6 × 10-5m

B. 11.6 × 10-9m-1

C. 14.6 × 10-5m

D. 1.46 × 10-9m

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4

The orbitals with maximum number of possible orientation is:

A. s

B. d

C. f

D. p

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4

The number of neutrons present in K1939 are

A. 28

B. 39

C. 20

D. 19

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4

No two electrons in an atom can have the same values of all four quantum numbers according to

A. Hund's rules

B. Flemming rule

C. Pauli's exclusion principle

D. Bohr theory

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4

Davisson and Germer gave an experimental evidence for

A. wave nature of electron

B. particle nature of electron

C. particle nature of light

D. wave nature of light

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The maximum number of electrons that can be accommodated by an atom in g-sub-energy level are

A. 20

B. 25

C. 18

D. 12

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Isotopes have different

A. arrangement of electrons

B. no. of P and e'

C. no. of neutrons

D. no. of electrons

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The ion that is isoelectronic with CO is

A. CN-

B. O2+

C. O2-

D. N2+

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Isotones have same

A. mass number

B. nuclear mass

C. no. of neutrons

D. no. of electrons

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4

The interrelationship between matter and energy was given by

A. Rutherford

B. Joule

C. de Broglie

D. Einstein

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In the case of atomic spectrum of hydrogen which series of lines lie in the visible region?

A. Balmer

B. Paschen 

C. Pfund

D. None of these

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4

Among the following ions, which are has the highest paramagnetism?

A. [Cr(H2O)6]+3

B. [Fe(H2O)6]+2

C. [Cu(H2O)6]+2

D. [Zn(H2O)6]+2

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4

β rays are a stream of

A. He

B. electrons

C. positron

D. neutrons

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4

In an atom of hydrogen, which of the following orbitais has the lowest energy for an electron present in it?

A. 3r

B. 2p

C. 4p

D. 2s

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4

The relationship between energy of a radiation and its frequency was given by

A. Planck

B. Rutherford

C. Einstein

D. Joule

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The atomic number of an element having the valence shell electronic configuration 4s24p6 is

A. 35

B. 26

C. 23

D. 34

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The number of unpaired electrons in a chromic ion Cr+3 (atomic number 24) is

A. 6

B. 4

C. 3

D. 1

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The maximum number of electrons in a sub-energy level is equal to

A. 4(2l+1)

B. 2(2l+1)

C. 2n2

D. n3

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4

The atomic structure of an atom of an element is Is 1s2, 2s22p6, 3s23p6. The element is

A. Cl-35

B. S-32

C. N-18

D. O-16

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4

Charge on fundamental particle neutrino is

A. 0

B. +1

C. -1

D. None of these

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Which of the following has the highest mass?

A. Neutron

B. Alpha particle

C. Electron

D. Deuterium

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The number of neutrons in the deuterium atom is

A. 16

B. 3

C. 1

D. 0

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4

Wave number is defined as

A. 3λ

B. λ2nπ

C. h2π

D. 1λ