Fluorine has an atomic number of 9. Which of the following is true of fluorine? A.
It will lose an electron to become a cation.

B.
It will gain an electron to become an anion.

C.
It will form two covalent bonds to fill its outer shell.

D.
It will form three covalent bonds to fill its outer shell.

Temperatures in ponds and lakes vary by season. select the best answer from the choices provided t f

What form of anesthetic was used for field surgery

Which of the following is an advantage of using embryonic stem cells in medical research? a. the use of embryonic stem cells is much less expensive than the use of adult stem cells. o b. no living tissue is damaged when scientists use embryonic stem cells. o c. embryonic stem cells are able to differentiate into a wider range of cells than adult stem cells. d. there is no controversy surrounding the use of embryonic stem cells.