Which of the following is NOT a characteristic of most ionic compounds? When dissolved, they conduct an electric current.
They have low melting points
They tend to be solids
They are usually composed of metallic and nonmetallic elements

Which of the following particle(s) is/are responsible for atoms bonding?

Valence electrons
Protons
Neutrons
Positrons

What is lost from the nucleus of an atom when it emits an alpha particle?

two protons and two electrons
two protons and two neutrons
two neutrons only
two protons only