Question
Which is metalloid
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[Given : Atomic mass of $H =1, C =12, N =14, O =16, S =32, Cl =35$ ]

$I :$ The three elements are metals.
$II :$ The electro negativities decrease from $X$ to $Y$ to $Z$.
$III :$ The atomic radius decreases in the order $X, Y$ and $Z.$
$IV : X, Y$ and $Z$ could be phosphorus, aluminium and sodium respectively.