6. Oxygen has an atomic number of 8. What can you

conclude from this fact?

a. An atom of oxygen weighs 8 grams.

b. An atom of oxygen has 4 protons and 4 electrons.

c. An atom of oxygen has 8 positrons.

d. An atom of oxygen has 8 protons.

Explanation:

Oxygen has an atomic number of 8,

Then, it has eight electrons revolving round its nucleus.

And since it a neutral atoms.

Number of neutron ≈ number of electron

Number of proton = Number of electron.

Then, the number of proton is 8

So, we can find it mass number of molecular weight

Molecular weight = number of proton + number of neutron

Molecular weight = 8 + 8

Molecular weight = 16g/mol

So, the correct answer is D

An atom of oxygen has 8 protons.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.