Which statement describes the location of two types of subatomic particles in a helium atom?*

An atom that contains six protons, six neutrons, and six electrons has a mass of approximately*

Which term identifies the most probable location of an electron in the wave-mechanical model of the atom?*

Which element has atoms in the ground state with the greatest number of valence electrons?*

Which group on the Periodic Table has two elements that exist as gases at STP?*

Which list of elements contains a metal, a metalloid, and a nonmetal?*

What is the charge of the nucleus of a copper atom?*

At STP, O₂(g) and O₃(g) have different properties because O₃(g) has*

A compound is a substance composed of two or more elements that are*

Which element has the highest boiling point at standard pressure?*

How many pairs of electrons are shared between the nitrogen atoms in a molecule of N₂?*

A molecule must be nonpolar if the molecule*

Which property is used to determine the degree of polarity between two bonded atoms?*

In a chemical reaction, a catalyst provides an alternate reaction pathway that*

Which substance can be decomposed by chemical means?*