The number of neutrons in an atom of nitrogen-14 (atomic number 7) is:

Name the three fundamental particles of an atom and give the charge and relative mass of each.

What is the octet rule, and which family of elements already obeys it?

What are isotopes? Give one example and state why they have the same chemical properties.

An atom has an atomic number of 17 and a mass number of 35. Write its electronic configuration and state the number of neutrons.

Explain the formation of a molecule of sodium chloride, naming the type of bond formed.

An element has two isotopes of mass numbers 35 and 37 present in the ratio 3 : 1. Calculate its average atomic mass.