An electrically neutral atom of beryllium has four protons. Which statement is true?

A: There is a charge of +4 on an atom of beryllium.

B: There is a charge of −4 on an atom of beryllium.

C: There are four electrons.

D: There are four neutrons in the nucleus.

Which fact represents evidence for the big bang theory?

Which property of water causes water drops to bead on a freshly waxed car?

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt