how is the average atomic mass calculated using the mass numbers and abundances of different isotopes? what is the mass number of the most abundant isotope of each of the first 20 elements?

By the way, the mass of an element is not equal to the sum of the masses of ... As long as the number of atoms remains the same the relative mass does not change. The atomic number is equal to the number of protons in the atom, therefore silicon ... What would happen to the atomic number and mass number? It would be an ... The mass number is equal to the number of protons plus neutrons. In a neutral atom, the number of protons equals the number of electrons. The charge on an ion ... ... number of protons equals the number of electrons. Because these particles have the same but opposite charges, equal numbers cancel out, producing a neutral atom ... Sep 3, 2020 ... ... mass unit (amu). The amu was originally defined based on hydrogen ... equal to its mass number (a whole number sum of protons and ... The total number of protons and neutrons (together known as nucleons) in an atomic nucleus. It is approximately equal to the atomic (also known as isotopic) ... ... equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the ... ATOMIC MASS NUMBER (A) - A number equal to the number of nucleons (neutrons plus protons) within the nucleus of an atom. ATOMIC MASS UNIT (amu) - The atomic ... The number of neutrons in the nucleus is equal to A minus Z. chemical symbol. Two different forms, or isotopes, of carbon are shown below: Carbon-12: with 6 ... Having numbers of chromosomes not equal to exact multiples of the haploid number ... mass number; chemical properties of isotopes of a particular element are ...