Hola alguien me puede ayuda esto no se como

Of the groups of elements below, which are most likely to gain electrons to become anions? a. alkali metal b. boron group c. halogen d. transition metal

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule

What is the molarity of the solution produced when 145 g of nacl is dissolved in sufficient water to prepare 2.75 l of solution?