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The total number of protons and neutrons...

The total number of protons and neutrons present in the atom of an element is known as its mass number. It is represented by A.
Mass number (A)=Number of protons +Number of neutrons (n)
`implies` mass of number (A)=Atomic number (Z)+ Number of neutrons (n)
`implies A=Z+n`
Number of neutrons in nucleus
We know `A=Z+n implies n=A-Z`
A,B and C are the number of neutrons in hydrogen, helium and lithium. A+B+C=

A

5

B

6

C

7

D

8

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The total number of protons and neutrons present in the atom of an element is known as its mass number. It is represented by A. Mass number (A)=Number of protons +Number of neutrons (n) implies mass of number (A)=Atomic number (Z)+ Number of neutrons (n) implies A=Z+n Number of neutrons in nucleus We know A=Z+n implies n=A-Z In an element A=Z identify the element

The number of protons and neutrons is always equal in an atom of an element .

Knowledge Check

  • The mass number A, atomic number Z and number of neutrons n are related as

    A
    n= A-Z
    B
    n = A + Z
    C
    n= A`xx`Z
    D
    none of these.

  • The atomic number of an element is 11 and its mass number is 23. The respective number of elec­ trons, protons and neutrons in this atom will be

    A
    11, 11, 12
    B
    11,12, 11
    C
    12, 11, 11
    D
    23, 11,23

  • Which of the following are true for an element ? (i) Atomic number = number of protons + number of electrons (ii) Mass number = number of protons + number of neutrons (iii) Atomic number = number of protons = number of neutrons (iv) Atomic number = number of protons = number of electrons

    A
    (i) and (ii)
    B
    (i) and (iii)
    C
    (ii) and (iii)
    D
    (ii) and (iv)

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