Eric a chemist is running tests with four unknown elements he has found that they all bond the same way so he knows that they are in the same group on the periodic table of elements the table shows the other properties that eric observed these four elements are most likely in group

The elements most likely are halogens because if we talk about manner of bonding they all are diatomic molecules and need one electron to fill their outermost shell. That is why they bond with other atom of own type and exist as diatomic molecule in pure state. However, all halogens are so reactive that they react with metals through strongest type of ionic bonds and form salts.

They all tend to form salts when they react with metals like NaCl and that is why they are commonly known as salt dormers.

They perfectly show significant trends in some properties like atomic radius increases from top to bottom, boiling and melting temperature increase down the group and electronegativity value decrease from top to bottom.

The elements belong to group 17.

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The answer 17. which are halogens

Explanation:

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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.