Which of the following statements is correct?
a. blue litmus paper stays blue when placed in an acid.
b. red litmus paper stays red when placed in a base.
c. blue litmus paper turns red when placed in a base.
d. red litmus paper turns blue when placed in a base.

1) how many electrons are in each energy level of the following elements? a. he b. na c. na d. ne 2) how many valence electrons are percent in the following atoms? a. s b. mg c. be d. cl 3) which of the following elements are stable as atoms? a. he b. o c. cl d. ar if you are able to provide the work as to how you got the answers that would be greatly appreciated. : )

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.

Which type of intermolecular force is pbr3