Which of the following is not a characteristic of electromagnetic waves?

a.) they can be refracted

b.) they can travel through a vacuum.

c.) they can travel at various speeds through any one material.

d.) they can be reflected.

How is the atomic number of a nucleus changed by alpha decay

Plzz a sample of table sugar (sucrose, c12h22o11) has a mass of 7.801 g. ● a) calculate the number of moles of c12h22o11 in the sample b) calculate the number of moles of each element in c12h22o11 (number of moles of c, number of moles of h & number of moles of o) in the sample. (use your answer from part a as your starting point.) show your work and highlight your final answer. calculate the number of atoms of each element in c12h22o11 (number of atoms of c, number of atoms of h & number of atoms of o) in the sample. (use your answers from part b as your starting for each element.) show your work and highlight your final answer.

The semi-conductors on the periodic table are classified as