Q45 of 149 Page 192

What is a neutron? State its relative mass and charge.

A neutral particle found in the nucleus of an atom is known as neutrons. Neutron has no charge on it with a relative mass of 1u.


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43

An element has atomic number 13 and an atomic mass of 27.

(a) How many electrons are there in each atom of the element?


(b) How are these electrons distributed in the various energy levels?

 44

Write the distribution of electrons in an atom of element whose atomic number is 18. What is special about the outermost electron shell (or valence shell) of the atom of this element?

 46

Compare an electron, a proton and a neutron in respect of their relative masses and charges.

 47

What is a proton? How does it differ from a neutron?