How many electrons will each ele- ment gain or lose in forming an ion?
a. calcium
c. aluminum
b. fluorine
d. oxygen

Can someone please also explain to me how I will know when wich Element loses or gains electrons?

A2-kg bowling ball is 1 meter off the ground on a post when it falls. just before it reaches the ground,its traveling 4.4 m/s. assuming that there is no air resistant, which statement is true a. the initial potential energy is less then the final kinetic energy b. the mechanical energy is not conserved c. the mechanical energy is conserved d. the initial potential energy is greater than the final kinetic energy