(a) Name the three sub-atomic particles of an atom, (b) An atom of an element has 5 electrons in L shell. (i) What is the atomic number of the element? (ii) State its valency. (iii) Identify the element and write its name


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(a) Electrons, protons and neutrons.
(b) (i) 7
(ii) 3 (-3)
(iii) Nitrogen