How many energy levels does sulfur have?

The noble gases are essentially non-reactive. This is because

The atoms of the elements in this group are the most chemically reactive of the ones listed

An atom whose valence electron shell is nearly full is ________ chemically reactive.

At atom that has only one electron in its valence electron shell is ________ chemically reactive.

Which of the following is false about a neutral atom of hydrogen?

How many electrons would a neutral atom of nitrogen need to gain in order to have a full valence electron shell?

How many electrons would a neutral atom of nitrogen need to lose in order to have a full valence electron shell?

Using the periodic table of elements, how many total electrons does a neutral atom of beryllium have?

If beryllium gains one electron, it will become

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