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Standard XII

Chemistry

Electronic Configuration

The electroni...

Question

The electronic configuration of $M^{2 +}$ ion is 2, 8, 18, 7. Determine the number of neutrons present in the nucleus of the neutral atom. Given, mass number of the atom = 80.

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Solution

The correct option is B 43

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Similar questions

Q. An atom has the electronic configuration of

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}, 4 s^{2} 4 p^{2}

. Its atomic weight is

80

. Its atomic number and the number of neutrons in its nucleus shall be:-

Q. The electrons configuration of a dispositive ion

M^{2 +}

is 2, 8, 14 and its mass number is 56. The number of neutrons present is :

Q. An elements has electronic configuration

2, 8, 18, 1

. If its atomic weight is

63

, then how many neutrons will be present in its nucleus?

Multiple Choice Questions

(a) The outermost shell of an atom is known as

(i) valency

(ii) valence electrons

(iii) nucleus

(iv) valence shell

(b) The number of valence electrons present in magnesium is

(i) two

(ii) three

(iii) four

(iv) five

(i) proton

(ii) neutron

(iii) electron

(iv) nucleon

(d) If the atomic number of an atom is 17 and mass number is 35 then number of neutrons will be

(i) 35

(ii) 17

(iii) 18

(iv) 52

(e) The number of electrons in an atom is equal to the number of

(i) protons in a neutral atom

(ii) neutrons in a neutral atom

(iii) nucleons in a neutral atom

(iv) none of the above

(f) The sum of number of protons and number of neutrons present in the nucleus of an atom is called its

(i) mass number

(ii) atomic number

(iii) number of electrons

(iv) all of the above

An element A atomic number 7 mass number 14

B electronic configuration 2, 8, 8

C electrons 13, neutrons 14

D Protons 18 neutrons 22

E electronic configuration 2, 8, 8, 1

State (i) valency of each element (ii) which one is a metal (iii) which is a non-metal (iv) which is an inert gas.

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The electronic configuration of M2+ ion is 2, 8, 18, 7. Determine the number of neutrons present in the nucleus of the neutral atom. Given, mass number of the atom = 80.

The correct option is B 43

The electronic configuration of $M^{2 +}$ ion is 2, 8, 18, 7. Determine the number of neutrons present in the nucleus of the neutral atom. Given, mass number of the atom = 80.