Question #6585c

1 Answer
David Drayer ยท Astralboy
Apr 21, 2017

The atomic number of any atom tells us how many protons it has

Explanation:

The atomic number of Helium is 2. That means that it has 2 protons.

As a neutral atom has equal number of protons and electrons. So the atomic number of 2 tells us that Helium in its neutral ground state also has 2 electrons. An electron configuration of 1s^2

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