When hydrogen and oxygen combine to create water the are shared between the atoms in the newly formed compound

a) protons
b) neutrons
c) orbitals
d) valence electrons

Valence electrons.

Explanation:

Electron, proton and neutron are the sub atomic particles of the atoms. The electrons revolve around the nucleus whereas the protons and neutron remains inside the nucleus.

The water contains hydrogen and oxygen. The electrons are shared between the hydrogen and oxygen to form the new compound water. The electrons participate in the formation of compound because they are present outside the nucleus.

Thus, the correct answer is option (D).

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.