Which best describes the force of the Earth's gravity on a ball thrown 20 metres straight upward? A. The gravitational force is constant.
B. The gravitational force is weaker when the ball is at it's highest point.
C. The gravitational force is strongest when the ball is at it's highest point.
D. The gravitational force is zero.

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72