John Dalton proposed the idea of atoms being indivisible in the early 19th century as part of his atomic theory.
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No, atoms are not indivisible. Sub-atomic particles, such as protons, neutrons, and electrons, exist within atoms, as discovered through experiments.
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.