The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.

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Solution

(a) Atomic number = total number of protons = number of electrons = 2 + 8 + 8 = 18

(b) The electronic configuration is stable thus it is an inert gas and hence non-metal

(c) The atom of element z will not form any ion because it has a completely filled outer most sell ( having 8 electrons) due to which it can neither lose electrons nor gain electrons to form an ionic.

(d) The outer most electron shell of the atom of this element is completely filled with electrons.

(e) Argon (Ar)

(f) Noble gases (or inert gases)

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