Which two elements, in looking at their atoms, have a total of 51 protons between them? Question 1 options:

Magnesium and Aluminum

Lithium and Scandium

Tin and Hydrogen

both A and B

Heat is involved in chemical change in two ways; chemical changes either result in heat being added to or removed from an object, and chemical changes require a certain amount of heat before they can take place.

Ionic compounds dissociate into component ions dissolved into a solution creating substances called "electrolytes".hope my answer has you : )

English , i don't understand spanish.

True or false:   the purpose of a defense mechanism is to get uncomfortable feelings out into the open so they can be dealt with in a healthy manner.indeed true: )