write the properties of an atom
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small
cant be divisible
not seen by eyes naked
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★ Properties of Atom :-
Atomic Number :
- The atomic number tells you how many protons an atom has. For example, every hydrogen atom has the atomic number 1 because it only has 1 proton.
Atomic Mass :
- The atomic mass is the number of portions and neutrons in an atom. Although all atoms of the same element have the same number of protons, they sometimes have more neutrons. Such atoms are called isotopes.
Electric charge :
- Normally, an atom is electrically neutral. But it can gain or lose electrons when it crashes with other atoms. Atoms that gain or lose electrons are called ions. They have an electric charge.
- Atoms that lose electrons become positive ions; atoms that win electrons become negative ions.
Radioactivity :
- In some atoms the nucleus can change naturally. Such an atom is radioactive. When a nucleus changes it produces rays.
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