What is the number of protons and neutrons in the nucleus of an atom?

Answer 1

Well, their sum is the atomic mass of the nuclide.

Nuclei are conceived to contain #"protons"#, fundamental, massive charged particles, and #"neutrons"#, fundamental, massive particles of zero charge. On nuclear scales, the particles are so attracted by nuclear interactions that the electrostatic repulsion that operates between like charges is overcome.
The number of #"protons"# determines the identity of the element. #Z=1#, #"hydrogen"#; #Z=2#, #"helium"#; #Z=3#, #"lithium"#;...........................#Z=45#, #"rhodium"#. Of course, you would know this well.
Individual elements can have various numbers of neutrons, and this variability gives rise to the existence of isotopes; the same element that has different number of neutrons. For instance, most hydrogen nuclei contain the one nuclide, the proton, to give the protium isotope, #""^1H"#; a few nuclei contain a proton and a neutron to give the deuterium isotope, #""^2H#; and a smaller few nuclei contain a proton and 2 neutrons to give the tritium isotope, #""^3H#,

As the nucleus gets bigger, a greater range of isotopes becomes possible, and the atomic masses quoted on the Periodic Table are the weighted average of the individual isotopes.

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Answer 2

An atom's mass number can be used to calculate the number of neutrons, whereas the atomic number, or the number of protons in the atom's nucleus, is the same as the atom's atomic number.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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