Question

an atom/ion has atomic mass 40 . if it has 20 neutrons and 18 electrons. assign symbol to the the atom or ion​

Answer 1

Answer:

Explanation:

uestion 16.

Who discovered neutron?

Answer:

Chadwick.

Question 17.

What are nucleons? What is their number called?

Answer:

Protons and neutrons present in the nucleus are collectively called nucleons. Their total number is called ‘mass number’.

Question 18.

What do you mean by ‘Atomic number’?

Answer:

Atomic number of an element is

Answer 2

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