Question

Which of the following is an element?
A. MgBr
B.HCI
C.O
D.Cu(SO4)3

Answer 1

C. O

An element is a pure substance made up of only one type of atom. It cannot be broken down into simpler substances by chemical means. Of the options listed, only "O" is an element. "MgBr" is a compound made up of magnesium and bromine atoms, "HCI" is a compound made up of hydrogen and chlorine atoms, and "Cu(SO4)3" is a compound made up of copper, sulfur, and oxygen atoms.

Answer 2

C.O

Step-by-step explanation:

"C. O" (Oxygen) is an element.

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It is made up of only one type of atom, with the same number of protons in its nucleus.

A. MgBr (Magnesium bromide) is a compound, which is made up of two or more elements chemically combined in a fixed ratio.

B. HCI (Hydrogen chloride) is a compound, made up of hydrogen and chlorine.

D. Cu(SO4)3 (Copper sulfate) is a compound, made up of copper, sulfur, and oxygen.