Dalton's atomic Theory and Atoms with subatomic particles

Who discovered the X rays?

A particle that is composed of a negative charge.

Found in the nucleus of an atom.

4 grams of hydrogen reacts with some oxygen to make 36 grams of water. How much oxygen must have been used by applying the law of conservation of mass?

Matter is neither created nor destroyed during chemical reaction but changes from one form to another.

• True

• False

Who established the law of definite proportion?

There are 100 g of two different compounds that are composed of Sulfur and Oxygen. The first compound contains 50 g of sulfur and the second compound contains 40 g of sulfur. How these data illustrate the law of multiple proportions?

If magnesium has an electron of 12, what is the atomic number magnesium?

Element Tin has protons of 50 and neutrons of 69. What would be the mass number of Sn?

Radon is a radioactive element, If radon has 222 atomic mass and 86 protons, what is the neutron of Rn?