<span>When an electron, which is negatively charged, moves towards an electronegative atom, the electronegative atom pulls in the electron. This causes the electronegative atom to be reduced. This entire process also releases energy.</span>
The answer is PO4^-3 is non-polar.
Wave speed = frequency x wavelength
= 100 x 0.3
= 30 m/s.
Hope this helps!
Your answer would have to be #3
