4. Describe the differences in the atomic structures of a hydrogen atom and a helium atom

A helium atom consists of a nucleus containing two positively charged protons and two neutrons, encircled by two orbiting electrons which carry a negative charge. A hydrogen atom has just one proton and one electron. The difference is that the nucleus is 4.1 times heavier than normal.

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >

b.

the accuracy of the data.