Answer:
<u>Metalloid -</u>
A metalloid is a chemical element with properties intermediate between those of typical metals and nonmetals
<u>Alloy</u> -
An alloy is a mixture of metals or a mixture of a metal and another element. Alloys are defined by a metallic bonding character.
I believe it’s D because phosphorus has the mass of 30.9.
Explanation:
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Concave mirrors, magnifying lens... sorry not sure about the rest
