The number of protons in the nucleus of the atom is 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 sum of the number of protons and neutrons in the nucleus.Click to see full answer. Also know, what is a rule for determining the mass quizlet?what is a rule for determining the mass number of an atom or ion. mass number=protons + neutrons. which particles affect the stability of the atom. protons and neutrons. which particles don’t affect the stability of the atom.Also Know, how do you find average mass in chemistry? The average atomic mass for an element is calculated by summing the masses of the element’s isotopes, each multiplied by its natural abundance on Earth. When doing any mass calculations involving elements or compounds, always use average atomic mass, which can be found on the periodic table. Correspondingly, what are the three rules for atoms? That is, we follow the three important rules: Aufbau’s Principle, Pauli-exclusion principle, and Hund’s Rule.What is the rule for making a positive atom?If there are more protons than electrons, then the element is a positive ion. If there are more electrons than protons, then the element is a negative ion. The amount of neutrons does not play a factor into making a difference between an atom or an ion.
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