Answer:
D) Number of electrons.
Explanation:
Elements in the same group on the periodic table has the same number of electrons. These electrons are those involved in bonding with other atoms to form compounds.
Answer:
In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration.
Explanation:
Answer:

Explanation:
<u><em>Newton's Third Law of Motion States that:</em></u>
"For every action, there is a reaction which is equal in magnitude but opposite in direction."
Newton's third law is also called "Law of Interaction".
Hope this helped!
<h2>~AnonymousHelper1807</h2>
Explanation:
The Doppler effect states that "there is an decrease in frequency of sound, light and other forms of waves as the separation between the source and observer increases".
This leads to low pitch of sound being heard as source of sound moves away.
The Doppler effect also suggests that as a source approaches an observer, there is an increase in frequency of waves.
- This is why the sound heard by a siren fades away as a police vehicle moves away.
- Also, the intensity of light fades when we move away from it.
Learn more:
Frequency brainly.com/question/5354733
#learnwithBrainly