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The mass number indicates the sum of the number of protons and neutrons of the isotope. The mass number, nucleon number or atomic mass indicated about the respective chemical symbols in the Periodic Table are average figures based on the different isotopes and their relative abundance. That is why there are decimals in mass numbers in the periodic table. It can be used to compare the relative atomic masses of different atoms.

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Q: What number represents the mass number?
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Related questions

What number represents the protons and nuetrons?

The mass number


What does atomic mass number elements symbol elements name and atomic mass tell you about the element?

The element symbol represents one mole of element , atomic number represents number of protons, atomic mass represents sum of protons and neutrons.


The mass number represents the number of?

The mass number is the sum of the neutrons and protons which exist in the atomic nucleus of an isotope.


Does mass number of an atom actually represents the mass of an atom?

The mass number is sum of neutrons and protons in the atomic nucleus.


What is a whole number which represents the total number of protons and neutrons?

This is the mass number.


What does the periodic number tell you about the element in the period?

The atomic number represents the number of protons. The atomic mass represents the number of protons + neutrons.


What does the number represent in platinum-195?

It represents the atomic number and atomic mass. Mass number is the superscript Atomic number is the subscript


Consider the element Phosphorus 30P The number 30 represents the?

mass number


What does the number 48 in the name krypton-84 represent?

It represents the mass number.


What represents the sum of proton in the nucleus of an atom?

mass number


What is the same as the atomic mass number of an element?

Atoms atomic number represents their number of protons.


What does themass number represent?

The mass number represents the total number of protons plus neutrons.