Answer:
C. W is a metal and X is a non-metal
Step-by-step explanation:
The elements in the "Periodic Table" are arranged in groups according to their characteristics.
X- Selenium
Z- Xenon
W- Magnesium
Y- Barium
A. X has a lower boiling point than Y. Selenium's boiling point is 685 while Barium's boiling point is 1,140. This makes choice A incorrect.
B. Y is a metal while Z is a non-metal. This makes choice B incorrect.
C. Both W and X are non-metals. Both are in the Alkaline Earth group. This makes choice C correct.
D. Z has different chemical properties than W because they don't belong in the same group. Z is a noble gas while W is an Alkaline Earth Metal.