Question

first 20 elements with number of electrons number of protons and atomic mass

Answer 1

Answer:

The atomic mass of a solitary atom is just its absolute mass and regularly expressed in atomic mass units or amu. By the definition, the carbon atom with six neutrons, denoted as carbon-12, has an atomic mass equal to 12 amu. Different atoms don't by and large have round-number atomic masses for reasons that are a little past the extent of this article. All in all, however, an atom's atomic mass will be extremely near its mass number yet will have some deviation in the decimal spots.