Atomic Structure MCQ Question with Answer

Atomic Structure MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

Question No : 36
The atomic number of an element having the valence shell electronic configuration $4 s^{2} 4 p^{6}$ is

Question No : 37
In the nucleus of ${}_{20}C a^{40}$ there are

40 protons and 20 electrons

20 protons and 40 electrons

20 protons and 40 neutrons

20 protons and 20 neutrons

Question No : 38
The relationship between energy of a radiation and its frequency was given by

Planck

Rutherford

Einstein

Joule

Question No : 39
In an atom of hydrogen, which of the following orbitais has the lowest energy for an electron present in it?

Question No : 40
The angular momentum of the moving electron is equal to

\sqrt{n h}

\frac{h^{2}}{2 π}

\frac{n h}{π}

\frac{n h}{2 π}

Question No : 41
$β$ rays are a stream of

electrons

positron

neutrons

Question No : 42
The possible values of l for an s orbital are

-1, +1

0 to 2

-2 and + 1

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