An atom is a small building block that forms matter. many different models of an atom have been made over the years. which of the following is not a reason why so many models of the atom have been made?
a
the atom has changed over the years.

b
new information led to new explanations.

c
scientists questioned each other's work.

d
new equipment allowed for new discoveries

The correct option is A) The atom has changed over the years.

Explanation:

Option A is not correct because an atom does not change. It remains the same always. The structure of an atom will always contain neutrons, protons and electrons.

Scientific theories tend to change over time as new information is brought up. Novel techniques lead to more advanced experiments and results. As a result, a scientific theory is subjected to change whenever evidence is found for a new theory which challenges the older one.

The atomic theory has changed many times due to novel scientific techniques and experiments.

Answer : The molar concentration of in the solution is, 4.27 M

Explanation : Given,

Mass of = 25.0 g

Volume of solution = 100.0 mL

Molar mass of = 58.5 g/mole

Molarity : It is defined as the number of moles of solute present in one liter of volume of solution.

Formula used :

Now put all the given values in this formula, we get:

Therefore, the molar concentration of in the solution is, 4.27 M