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Standard X

Chemistry

Atomic Number

The total num...

Question

The total number of protons present in the nucleus of an atom is referred to as the ____________(atomic number/ mass number).

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Solution

Atomic number is equal to the number of protons or electrons present in the nucleus of an atom of an element.
It is represented by the letter Z.
Atomic number(Z)= number of protons (p).
Therefore, the total number of protons present in the nucleus of an atom is referred to as the atomic number.

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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

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The total number of protons present in the nucleus of an atom is referred to as the ____________(atomic number/ mass number).

Atomic number is equal to the number of protons or electrons present in the nucleus of an atom of an element.It is represented by the letter Z.Atomic number(Z)= number of protons (p).Therefore, the total number of protons present in the nucleus of an atom is referred to as the atomic number.

Atomic number is equal to the number of protons or electrons present in the nucleus of an atom of an element.
It is represented by the letter Z.
Atomic number(Z)= number of protons (p).
Therefore, the total number of protons present in the nucleus of an atom is referred to as the atomic number.