Q. Atoms are composed of:
- Electrons and protons
- Electrons only
- Protons only
- Electrons and Nuclei
Answer: D
Atoms are composed of Electrons and Nuclei.
· Every atom is composed of a nucleus and one or more electrons bound to the nucleus.
· The nucleus is made of one or more protons and typically a similar number of neutrons.
· Protons and neutrons are called nucleons. More than 99.94% of an atom's mass is in the nucleus.
· The protons have a positive electric charge, the electrons have a negative electric charge, and the neutrons have no electric charge.
· If the number of protons and electrons are equal, that atom is electrically neutral.
· If an atom has more or fewer electrons than protons, then it has an overall negative or positive charge, respectively, and it is called an ion.
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