What experimental evidence leads scientists to believe that only quantized electronic energy states exist in atoms?

Bohr atomic model. The most important experiment in proving the theory of the amount of energy states in an atom was when Bohr tested the motion of the electron in the hydrogen atom which was not possible in Rutherford's previous experiment. Bohr's principles were: 1- Each electron has an amount of energy 2- Electrons have an orbit and the more energy farther from the nucleus 3- The more energy the more energy from the electron increases 4-Each electronic layer has a number and are represented by the letters K, L, M, N, O, P, Q.

the answer is a and have a great day

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.