Newton's first law of motion is that an object in motion will tend to stay in motion unless an external force acts upon it.
If Calcium lost two electrons, it would have the same number of electrons as Argon which has 18 electrons.
Answer: Because new theories can come out that better explain observations and experimental results can replace old theories.
Explanation: Theories more than ten years old are usually out of date. Scientists want to prove that the work of other scientists is wrong. New evidence that supports a change prompts scientists to modify earlier theories.
0.25 m/s squared
hope this helps x
