Argon, neon, and xenon are examples of a) halogens b) metalloids c) noble gases d) alkali metals

Argon, neon and xenon are examples of noble gases.

C is correct option.

Explanation:

According to electronic configuration

Argon:

The atomic number of argon is 18.

The electronic configuration of argon

Ar= 2,8,8

Neon:

The atomic number of argon is 10.

The electronic configuration of argon

Ar= 2,8

Xenon:

The atomic number of argon is 54.

The electronic configuration of argon

Ar= 2,8,18,18,8

Argon, neon and xenon are examples of noble gases because the last shell is completely filled and they does not participate in any reaction so, these atoms are called noble gasses.

Hence, Argon, neon and xenon are examples of noble gases.

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.