Question

. The atomic number and mass number of an element are 4 and 9 respectively:

(a) What is number of protons?

(b) How many electrons are present?

(c) How many neutrons are present?

(d) Draw the geometrical model of the atom.​

Answer 1

Answer:   Given - Mass number of atom = 23

                               Atomic number of atom = 11

As, no. of electrons in an atom is equal to an atomic number of the element.

So, number of electrons = 11

Secondly , number of protons are equal to number of electrons.

so, number of protons = 11

And number of neutrons = mass number - atomic number = 23−11 = 12

so, number of neutrons = 12

So , the atom contains 11 protons, 11 electrons, 12 neutrons.

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