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Which of these statements did you include in your answer? Check all that apply. Elements are pure substances with only one type of atom. The substances on Earth are created when two or more elements are combined. Because elements can combine to form compounds, more substances can be created on Earth.

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The correct answers are:

A. Elements are pure substances with only one type of atom.

B. The substances on Earth are created when two or more elements are combined.

C. Because elements can combine to form compounds, more substances can be created on Earth.

Answer : All the statements are correct.

Explanation :

  • Atom : It is a smallest unit of matter which can not be further divide.
  • Element : It is a pure substance which is composed of atoms of similar elements.

For example : The molecule of hydrogen element [tex](H_2)[/tex] is made from atoms of similar element (hydrogen).

  • Compound : It is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

For example : The carbon tetrachloride [tex](CCl_4)[/tex] is made from atoms of different elements (carbon and chlorine) combined together in a fixed ratio by mass.

Hence, all the statements are correct.

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