An uncharged atom of nitrogen (atomic number = 7) has __________.

What are the six most important chemical elements of life?

Fill in the blanks in this concept map to help you tie together the key concepts concerning elements, atoms, and molecules.

We can be sure that a mole of table sugar and a mole of vitamin C are equal in theira. mass.b. volume.c. number of atoms.d. number of molecules.

The reactivity of an atom arises froma. the average distance of the outermost electron shell from the nucleus.b. the existence of unpaired electrons in the valence shell.c. the sum of the potential energies of all the electron shells.d. the potential energy of the valence shell.

Changing the _________ would change it into an atom of a different element.a. number of electrons surrounding the nucleus of an atomb. number of protons in the nucleus of an atomc. electrical charge of an atomd. number of neutrons in the nucleus of an atom