Urgent

how do you use the periodic table to recall the ionic charge of an alkali metal, an alkaline earth metal, or aluminum?

a.) the positive charge is the group number

b.) the negative charge is the group number

c.) the positive charge is the period number

d.) the negative charge is the period number

Atriangle with equal sides of length 10 cm has -2.5-nc charged objects at each corner. part a determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. horizontally rightward vertically downward vertically upward horizontally leftward