Which one of the following is an example for a metal?

(a)

Iron

(b)

Oxygen

(c)

Helium

(d)

Water

Oxygen, hydrogen, and sulphur are examples for _______.

(a)

Metals

(b)

Non-metals

(c)

Metalloids

(d)

Inert gases

Which of the following is a short and scientific way of representing one molecule of an element or compound?

(a)

Mathematical formula

(b)

Chemical formula

(c)

Mathematical symbol

(d)

Chemical symbol

The metals which is a liquid at room temperature is _______.

(a)

Chlorine

(b)

Sulphur

(c)

Mercury

(d)

Silver

An element which is always lustrous, malleable and ductile is _______.

(a)

non-meta

(b)

metal

(c)

metalloid

(d)

gas