Question

One atom of an element consists of 19 protons and 20 neutrons.Mass number of the element will be

Answer 1

39 =a

as a =atomic no +no of neutron

Answer 2

One atom of an element consists of 19 protons and 20 neutrons.Mass number of the element will be 39.

Explanation:

It is known that mass of an atom or element is concentrated inside its nucleus. This is because nucleus of an atom contains both protons and neutrons present in the atom.

Hence, mass number is the sum of total number of protons and neutrons present in an atom. For example, mass of an element consisting of 19 protons and 20 neutrons is calculated as follows.

              Mass number = no. of protons + no. of neutrons

                                     = 19 + 20

                                    = 39

Therefore, we can conclude that mass number of the given element is 39.

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