Which characteristics are shared by electromagnetic and mechanical waves? check all that apply.

both have a crest and a trough.
both move due to particles bumping into each other.
both can move through matter.
both occur as a result of a disturbance.
both are formed by charged particles.

What can be found in the ionosphere

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent

A5.00 g of a in . g of at aa 5.00 g of b in . g of .?at .