science
Grade-9
Easy
Question
If an element has 18 electrons and 17 protons, what is that element?
- Cl2
- Cl-
- Cl
- All the above
Hint:
The atom that has 18 electrons, 17 protons, and 18 neutrons is Cl-.
The correct answer is: Cl-
- The atomic number of chlorine is 17.
- The Cl- has 18 neutrons and 17 protons in the nucleus of the atom.
- The chloride ion has 18 electrons.
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