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Sodium has the atomic number 11. How many electrons are in a sodium ion (Na)?

Theresa Perry

in Chemistry

1 answer

1 answer

Carlton Burgess on April 7, 2018

The atomic number is the number of protons of an atom. And, since atoms are electrically neutral and the charge of a proton is equal to charge of an electron, the number of electrons is equal to the number of protons. So that the neutral atom of sodium has 11 protons and 11 electrons. But, the sodium ion (Na+) has a positive charge, which means that it has lost a negative charge or an electron. Then, the sodium ion (Na+) 11 - 1 = 10 electrons. Then, the answer is that there are 10 electrons in a sodium ion.

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