One atom of silicon can properly be combined in a compound with a. four atoms of calcium. b. two atoms of oxygen. c. one atom of chlorine. d. three atoms of hydrogen.

1. Compound are substances which can be formed by chemically combining two or more elements.

1. Mixtures are substances that are formed by physically mixing two or more substances.

2. The properties of a compound are different from those of its element.

2. Mixture shows the properties of all its constituent elements.

3. The composition of element present in compound is fixed.

3. The composition of element present in mixture is not fixed.

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