Valence electrons

a. have the highest energy level number
b. are gained or lost to form ions
c. all of the above
d. none of the above

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax

Which of the following units is not an official si unit

Are oil and water a mixture or solution