Which of the following is true about subatomic particles

The correct answer is D.)

Electrons are negatively charged and the smallest subatomic particle. 
Neutrons have no charge and weigh about the same as a proton.
Protons have a positive charge and weight about the same as a neutron.

Hope this helps!

Ifound this on google “laws of chemical combination. it states that matter can neither be created nor destroyed. it stated that a given compound always contains exactly the same proportion of elements by weight.” i hope this you for what your looking for.