Which particles have approximately the same mass?

Which phrase describes an atom?

An orbital is defined as a region of the most probable location of

The bright-line spectrum of an element in the gaseous phase is produced as

An atom of lithium-7 has an equal number of

In which type of chemical reaction do two or more reactants combine to form one product, only?

Which statement explains why neon is a Group 18 element?

Which element has chemical properties that are most similar to the chemical properties of fluorine?

What occurs as two atoms of fluorine combine to become a molecule of fluorine?

What is the number of pairs of electrons that are shared between the nitrogen atoms  in a molecule of N₂?

Which set of values represents standard pressure and standard temperature?

Which statement about one atom of an element identifies the element?