Consider the following properties of an element:
(i) It is solid at room temperature.
(ii) It easily forms an oxide when exposed to air.
(iii) When it reacts with water, hydrogen gas evolves.
(iv) It must be stored submerged in oil. Which element fits the above description the best?
A) magnesium
B) sodium
C) sulfur
D) mercury
E) copper

Question

Quizplus · Accepted Answer

Sodium is a solid at room temperature, forms an oxide when exposed to air, reacts with water to release hydrogen gas, and must be stored in oil to prevent reaction with moisture and air.

Consider the Following Properties of an Element