By 'waves' do you mean sound waves? If so sound waves need to travel through things like solids, liquids and yup <u>gases. </u>When the waves travel they are vibrating the molecules in the matter. By doing this he molecules in solids are packed very tightly.
A synthesis would be A+B-->AB its combining, decomposition is AB-->A+B, its the breaking up of a substance.
Answer:
Atoms with<u>2</u>or less electrons in the outermost level tend to lose electrons
The atomic number of an element identifies the number of protons and electrons.
