Which phrase describes an Al atom?*

What is the number of electrons in an atom that has 20 protons and 17 neutrons?*

The mass of a proton is approximately equal to the mass of*

When a sample of CO₂(s) becomes CO₂(g), there is a change in*

Which properties are characteristic of Group 2 elements at STP?*

Compared to an atom of C-12, an atom of C-14 has a greater*

Elements that have atoms with stable valence electron configurations in the ground state are found in*

A magnesium atom that loses two electrons becomes a*

An atom of which element has the strongest attraction for the electrons in a bond?*

Which type of matter can not be broken down into simpler substances by a chemical change?*

According to Table F, which substance is most soluble in water?*

Given the equation representing a reaction:

H + H → H₂

Which statement describes the energy change in this reaction?*

Which sample of matter is a mixture?*

Paper chromatography can separate the components of a mixture of colored dyes because the components have differences in*

At standard pressure, the boiling point of an unsaturated NaNO₃(aq) solution increases when*