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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