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Standard IX

Chemistry

Proton

The number of...

Question

The number of protons in the nucleus of an atom is called its ________.

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Solution

Atomic number: Atomic number of an element is the number of protons present in the nucleus of an atom of that element.
Example: Atomic number of Carbon (C) is 6. Hence, number of protons in Carbon is also 6.
Therefore, the number of protons in the nucleus of an atom is called its atomic number.

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Similar questions

Fill in the blanks in the following statements :

(a) The number of protons in the nucleus of an atom is called its ....................

(b) The total number of protons and neutrons in the nucleus of an atom is called its ....................

(d) An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of the atom is ....................

(e) If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is ....................

(f) Almost all the mass of an atom is concentrated in a small region of space called the ....................

(g) Cathode rays are a beam of fast moving ....................

(h) The anode rays obtained from hydrogen gas consist of particles called ....................

(i) The maximum number of electrons that can be accommodated in L shell are ....................

(j) The maximum number of electrons that can go into the M shell is ....................

(k) The subatomic particle not present in a hydrogen atom is ....................

(l) The electron has .................... charge, the proton has .................... charge, and the neutron has .................... charge.

An atom has mass number A and atomic number Z.

How many protons are present in the 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

Q. The number of protons in the nucleus of an atom is called its atomic number.

The number of protons and neutrons present in the nucleus of an atom is called its _________.

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The number of protons in the nucleus of an atom is called its ________.

Atomic number: Atomic number of an element is the number of protons present in the nucleus of an atom of that element. Example: Atomic number of Carbon (C) is 6. Hence, number of protons in Carbon is also 6.Therefore, the number of protons in the nucleus of an atom is called its atomic number.

Atomic number: Atomic number of an element is the number of protons present in the nucleus of an atom of that element.
Example: Atomic number of Carbon (C) is 6. Hence, number of protons in Carbon is also 6.
Therefore, the number of protons in the nucleus of an atom is called its atomic number.