The dense, positivly charged center is called the __________.

This particle is responsible for the positive charge of the nucleus.

The outer shells have a negative charge due to these particles.

If an atom has an atomic number of 6, it is the element _________.

What is the atomic number for oxygen?

To which period does magnesium belong?

To which group does sodium belong?

How many electrons does nitrogen have?

Which is the most reactive group of metals on the periodic table?

Which is the most reactive group of nonmetals on the periodic table?

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