Question
How many numbers of protons and electrons are there in a magnesium ion?
- 12,12
- 10,12
- 12, 10
- 24, 12
Hint:
Magnesium ion has fewer electrons than magnesium atom.
The correct answer is: 12, 10
- The total number of protons in magnesium ion is 12 and the number of electrons is 10.
- The magnesium ion is known as a magnesium atom that has lost 2 electrons. The magnesium atom has an atomic number of 12, thus, the number of electrons and protons is also 12.
- In the magnesium ion, that is, Mg2+, two electrons are lost which makes a total of 10 electrons. Yet, the number of protons remains the same.
The number of protons is equal to the number of electrons until it becomes an ion.
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