No, atoms are not indivisible. Sub-atomic particles, such as protons, neutrons, and electrons, exist within atoms, as discovered through experiments.
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Atoms of different elements have unique numbers of protons in their nuclei, which determines their chemical properties and identity.
Atoms are the smallest units of matter, composed of protons, neutrons, and electrons. Molecules are groups of atoms bonded together.
The term “formula unit” is used for substances with ionic constituents because in ionic compounds, the smallest repeating unit is not a molecule but rather a formula unit consisting of ions in a fixed ratio.
The formula unit for an ionic compound is determined by balancing the charges of the constituent ions to create a neutral compound. For example, sodium chloride has a formula unit NaCl.