metalloids: boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), polonium (Po) and astatine (At)
ns2 → Group 1A and Group 2A
ns2 ns6 → Group 8A ( noble gases)
Which of the following outer electron configurations could belong to a metalloid?
b. ns2 np6
c. ns2 np5
d. ns2 np2
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