Speed = distance/time
= 400/72
=5.55 m/s
Here we have two physical quantities which we have to divide

other is

now we need to find its division

now we have

Answer:
That is false, Protons have a positive charge, Electrons have a negative charge, and Neutrons have a blank charge.
Explanation:
Answer:
d.
Explanation:
have a full 8 electrons on the outermost ring
Answer: wavelength !!
hope this helped :)