What is the smallest particle of an element that retains its properties?

Atom
Molecule
Compound
Ion

Which subatomic particle has a negative charge?

Electron
Proton
Neutron
Nucleus

Water (H?O) is an example of a _____.

Compound
Mixture
Element
Solution

What type of change occurs when ice melts?

Physical change
Chemical change
Nuclear change
Combustion

The periodic table is organized by increasing _____.

Atomic number
Mass number
Reactivity
Melting point

Which of the following is a chemical change?

Rusting of iron
Boiling of water
Breaking glass
Melting ice

In a neutral atom, the number of protons is equal to the number of _____.

Electrons
Neutrons
Isotopes
Molecules

The rapid reaction of a substance with oxygen, producing heat and light, is called _____.

Combustion
Condensation
Deposition
Evaporation