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the atomic number is determined by looking above top of the letter[s] on an element on the Periodic Table of elements

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11y ago
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15y ago

Atomic number is the number of protons in the Nucleus - the Atomic Mass is the total number of particles in the nucleus - i.e. number of Protons + Number of Neutrons

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12y ago

The atomic number is the number of protons and electrons found in the given element. The atomic weight is the weighted average of all the isotopes found.

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14y ago

The number of protons in the nucleus.

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Q: How was the atomic number and the atomic mass determined?
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Atomic mass is determined by the number of protons plus the number of?

Atomic mass is determined by the number of protons and neutrons in an atom's nucleus.


How are electrons determined?

By subtracting the atomic mass and atomic number


The atomic mass is determined by?

atomic mass is determined by adding the number of protons and neutrons.this can be seen in the periodic table as the average atomic mass below the name of the element


How is the atomic mass determined?

Atomic Mass is the number of protons in an atom plus the number of neutrons in the same atom.


How were the atomic number and the atomic masses of the elements determined?

Atomic masses are determined by mass spectrometry. The atomic number is identic with the number of protons in the atom - depends on position in the periodic table.


Is determined by the number of protons and neutrons in a atom?

Atomic mass.


How can an atoms number of neutrons be determined?

Mass number-Atomic Number= Number of neutrons


Which mass number or atomic number determine what element an atom is?

The identity of the element is determined solely by the atomic number, which is the number of protons.


What determines the atomic number of a substance?

The atomic number is the number of protons in the nucleus of an atom, while the atomic mass is the total mass of the nucleus (both protons and neutrons)


Why is the krypton atomic mass not determined?

The relative atomic mass is 83.798. So where did you get that it is not determined.


The atomic mass is determined by the weight of?

The number of protons, neutrons and electrons.


Do valence electrons determine the atomic mass?

No, the valance electrons determine the charge, the atomic number is determined by the number of protons. Generally, electrons are equal to protons, but in ions it is different, so use protons.