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)sulfur
B)copper
C)mercury
D)sodium
E)magnesium

Question

Quizplus · Accepted Answer

Sodium is a solid at room temperature (i), readily reacts with air to form sodium oxide (ii), and reacts with water to produce hydrogen gas (iii). It is also highly reactive and must be stored under oil to avoid reacting with air or moisture (iv). The other options do not fit all the descriptions given.

Consider the Following Properties of an Element: (I)It Is Solid