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  1. An atom is the most basic form of life. Also, an atom can represent an element. The element can be different such as oxygen, nitrogen, everything that is present in the periodic table. We can also classify an element into a metal, nonmetal or metalloid. The very core of an atom is the nuclei. Protons and neutrons are present inside the nuclei.  A combination of elements is a compound. When formed, they can be very stable. The answer is D.

  2. D. compounds

    A compound is a substance formed when two or more chemical elements are chemically bonded together. The elements in any compound are always present in fixed ratios.

  3. D. Compounds

    Explanation:

    Compounds are the substances made of two or more different elements. The atoms form the compounds to gain the stable form. Some of the examples of compounds are H2O (water), NaCl (sodium chloride), CO (carbon monoxide) etc.  

    Element of each atom in a compound has its octet completed which in turn imparts stability to the compound.

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