Name two elements that exist in the form of atoms.

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Solution

Group 18 elements are inert gas i.e., It does not react with other elements in normal conditions.
They are stable and hence monoatomic i.e., having only one atom in the free state as gases.
Argon(Ar) is a member of group 18 having the atomic number 18.
Neon(Ne) is a member of group 18 having the atomic number 10.
Atom- It is the smallest constituent unit of matter that possess the properties of the chemical element.
Atoms don’t exist independently.
Molecules- Molecules are made up of groups of atoms having independent existence.
Hence, Argon and Krypton are the two examples of gases in which the smallest particle is an atom.

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An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet-like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure.
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