No. It is possible for one atom of an element to have a different number of neutrons than another atom of the same element. For example, H usually has no neutrons, but deuterium has 1 neutron. An atom with a different number of neutrons is called an isotope.
Mass number!:)
The mass number is the sum of protons + neutrons.
20. the mass of an atom is determined by the sum of the number of neutrons and protons the atom has.
S with 17 neutrons and 16 protons has a mass number of 33 amu
17 electrons. The number of protons and electrons is always the same.
Mass number!:)
protons and neutrons in an atom. It is the sum of protons and neutrons in the nucleus of an atom.
The mass number is the sum of protons + neutrons.
20. the mass of an atom is determined by the sum of the number of neutrons and protons the atom has.
Sodium's atomic number is always 11 and is always the same as its protons.
The total amount of protons and neutrons in an atom is its mass number.
The number of protons and neutrons in the nucleus
Mass number = Protons+Neutrons
Protons, neutrons, and electrons are subunits present in equal numbers in an atom. The number of protons in an atom is equal to the number of electrons, while the number of neutrons can vary in different isotopes of an element.
atomic mass number - protons = number or neutrons
The number of protons
The mass number of an atom is the sum of the protons and neutrons in its nucleus. Therefore, for an atom of calcium with 20 protons and 20 neutrons, the mass number would be 40.