Explanation:
They come in different kinds, called elements, but each atom shares certain characteristics in common. All atoms have a dense central core called the atomic nucleus. ... All atoms have at least one proton in their core, and the number of protons determines which kind of element an atom is.
The common feature is that the atoms of all elements consist of electrons, protons, and neutrons.
An atom is a particle of matter that uniquely defines a chemical element.
An atom consists of a central nucleus that is usually surrounded by one or more electrons.
All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms.
For example, all helium atoms have two protons, and no other elements have atoms with two protons.
Learn more about an atom here:
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