Which scientific law states that matter cannot be created or destroyed?
a. first law of nature
b. newton's first law
c. universal gravitation
d. conservation of mass

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?

In which of the following is positive work done by a person on a suitcase

Because atoms of elements in the same group of thbecause atoms of elements in the same group of the periodic table have the same number of neutrons, they have similar properties. select the best answer from the choices provided t fe periodic table have the same number of neutrons, they have similar properties. select the best answer from the choices provided t f