When reacting with a chlorine atom, a sodium atom reacts by losing an electron to form the na+ ion, which is

Iknow #2 is d. i just need to know why

Maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.

Which other elements contain the same number of outer electrons as sodium