Question

the table shows the properties of three classifications of elements.

(a) __________	(b) __________	(c) __________
brittle	usually brittle	malleable
no conductivity	semi-conductors	good conductors

what are the best headings for columns a, b, and c?

a (a) metals, (b) non-metals, and (c) metalloids
b (a) non-metals, (b) metalloids, and (c) metals
c (a) metals, (b) metalloids, and (c) non-metals
d (a) non-metals, (b) metals, and (c) metalloids

Explanation:

• Non - metals: No luster, brittle, no conductivity. So column A matches non - metals.
• Metalloids: Shiny or dull, usually brittle, semi - conductors. So column B matches metalloids.
• Metals: Shiny, malleable, good conductors. So column C matches metals.

Answer:

B. (A) Non - metals, (B) Metalloids, and (C) Metals