Fill in the blanks : (i) the outermost orbit of an atom is called it's ____ shell. (ii) the valency of a ____ is zero. (iii) the valency of Mg ( atomic number= 12) is ______. (iv) A hydrogen atom needs ___ more to complete it's duplet . (v) The electronic configuration of neon atom is stable because it contains ____ electrons in it's outermost orbit.
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