There are many examples of atom, 106 in fact. Look at the Periodic Table of the elements.
well, there are calcium atoms, sodium, chlorine,
Some examples of atoms include calcium atoms, sodium, chlorine, and sulphur atoms.
Examples: atom of deuterium, atom of uranium-238, atom of helium-4 etc.
Gold
Molecules are not atoms, so I assume they can be classified as non-examples of atoms. Water is a molecule, and therefore not an atom. Water is comprised of two hydrogen atoms and one oxygen atom. Carbon is an atom.
Be the Club not the Atom
An atom is the smallest unit of an element that still maintains the physical properties of the element. Examples are: hydrogen, oxygen, gold, aluminum, neon, silver, carbon, potassium.
An example could be a diagram, or picture, or equation, etc.
Examples: a neutral atom, a neutron, a neutrino, etc.
the number of neutrons in each atom is not the same
An atom whose nucleus decays over time is called radioactive. Some examples of radioactive substances are uranium, plutonium, and einsteinium.
Examples of gases: oxygen, helium, radon, nitrogen, etc.
Compound is made out of different types of atoms. Some of the examples are, H20, Co2, KMno4. Elements are made out of only the same atom.
Examples (in the sense of non-radiactive): helium, oxygen, fluorine, argon, lanthanum, hafnium lithium etc.
When an atom loses electrons, it becomes a positive ion Examples: Na --> Na+ + e- Mg --> Mg2+ + 2e- When an atom gains electrons, it becomes a negative ion Examples: Cl + e- --> Cl- O + 2e- --> O2-