How to calculate the atomic weight of an element?

How to calculate the atomic weight of an element?

It is based on one twelfth of the mass of a kind of atom called carbon 12, divided by the mass of other atoms, and the ratio is the atomic weight. For example, the atomic weight of hydrogen is 1, and that of oxygen is 16
The ratio of the mass of an atom to 1 / 12 (about 1.66 × 10-27 kg) of the mass of carbon-12 is called the atomic weight of the atom, also known as the relative atomic mass, and the unit is 1. Since most elements are composed of two or more isotopes, the atomic weight is the average value calculated according to the percentage of each isotope, It is inconvenient to write, memorize, calculate and use. So the relative mass of atom is used to express the mass of atom internationally

What is the calculation of the atomic weight of matter?

An atom is made up of protons, neutrons and electrons. The mass of the atom is the sum of their masses. The mass of the electrons is usually ignored because they are too small. For example, the atom of carbon has six protons and six neutrons

The element with the smallest atomic weight
Is that right? If it is right, is this element hydrogen? Is it the most massive element with large atomic weight

For the elements that can be found in the periodic table, this statement is right!

What is the difference between the atomic weight of an element and its relative atomic mass? How to calculate it?

The definition is different. The relative atomic mass is relative to the mass of carbon 12. The original self mass is a simple mass without reference,