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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.

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What is the sum of protons and neutrons in an atom?

Mass number!:)


The mass number is used to calculate the number of?

protons and neutrons in an atom. It is the sum of protons and neutrons in the nucleus of an atom.


The mass number of an atom indicates the number of what?

The mass number is the sum of protons + neutrons.


What is the mass number of 10 protons and 10 neutrons?

20. the mass of an atom is determined by the sum of the number of neutrons and protons the atom has.


What is the atomic number of a atom that has 11 protons and 12 neutrons?

Sodium's atomic number is always 11 and is always the same as its protons.


What is the total amount of protons and neutrons in an atom?

The total amount of protons and neutrons in an atom is its mass number.


The mass number is used to calculate the number of what?

The number of protons and neutrons in the nucleus


What is the sum of protons neutrons in an atom?

Mass number = Protons+Neutrons


What subunits are present in equal numbers in an atom?

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.


What is atomic mass number minus protons?

atomic mass number - protons = number or neutrons


What particles make up the mass of an atom?

The number of protons


The mass number of an atom of calcium with 20 protons and 20 neutrons is?

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.