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The different isotopes have different Atomic Mass numbers, because the isotope has different numbers of neutrons. The protons and electrons are the same, so the change in mass number is the same as the change in the number of neutrons.

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Dahlia Miller

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2y ago
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13y ago

Atomic Mass is the average masses of all the isotopes known for that element as they occur in earth's nature.

Atomic number is the element's identity, the number of protons the nucleus has, will never change.

Mass number is [NOT just another way to say atomic mass.]

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Mass number is equal to the number of protons AND neutrons, that is of ONE particular isotope of an element. This is a round figure, not an average like atomic mass.

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15y ago

atomic number is the amount of protons. atomic weight is the mean atomic mass measured by the quantity of protons and neutrons taking into account all isotopes and their relative abundances.

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9y ago

The number of protons equal the atomic number.

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9y ago

Atomic number is equal to number of protons. They are same in number.

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Anonymous

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3y ago

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Q: How does the atomic number compare with the atomic weight?
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Related questions

Is the atomic weight the same as the atomic number?

No, the atomic number is the number of protons that an atom contains. Atomic weight is the number of protons and neutrons.


How was is the atomic number and the atomic weight of uranium found?

Atomic number of uranium: 92 Atomic weight of uranium: 238,02891


Atomic weight and atomic number of copper?

Its atomic number is 29 and its standard atomic weight is 63.5 g/mol.


What is the number of neutrons in an atomic number?

Subtract the atomic number from the atomic weight.


What is the number in front a chemical formula is called?

atomic number or atomic weight. Subscript: atomic number, superscript: atomic weight: 94Pu239 or 239Pu


What is carbons atomic weight?

Atomic Number = 6. Atomic Weight = 12.011


What is the element that has atomic weight 40?

Calcium has an atomic weight of 40. Other info about Calcium: Symbol: Ca Name: Calcium Atomic Number: 20 Atomic Weight: 40.08 Number of Neutrons: 20 (atomic weight - atomic number) Number of Protons: 20


Atomic weight is equal to the?

Atomic weight/ mass = number of protons + number of neutrons


Is the atomic number of an atom the number of neutrons?

Subtract the atomic number from the atomic weight.


The number of neutrons in an atom can be found by subtracting the atomic number from the?

Atomic weight in atomic mass units = the number of protons + the number of neutrons. The number of protons is your atomic number. Subtract that from the atomic weight for the number of neutrons.


Is atomic number the number of protons and neutrons?

No, the atomic number is the same number of protons and electrons. To find the neutrons, you subtract the atomic weight by the atomic number. Make sure to round the atomic weight as well.


What is the atomic number for carbon?

The atomic number is: 6. The atomic weight is 12.011