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The atomic number is dependent on the number of protons. The atomic weight is dependent on the number of protons and neutrons. As almost every element has some neutrons in its nucleus the atomic number will never be equal to the atomic weight.

The one possible exception is Hydrogen with a single proton. However there are two isotopes of hydrogen: deuterium and tritium. Deuterium has one proton and one neutron. Tritium has one proton and two neutrons. Therefore when taken as a whole the atomic weight of hydrogen will always be slightly greater than 1g/mole.

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Q: Is The atomic number is always equal to the atomic weight?
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Related questions

Does the number of protons in an atom of an element always equal its atomic weight?

atomic weight = mass of protons + mass of neutrons


What does the atomic number always equal inside an atom?

Atomic number is always equal to the number of protons in an atom.


Atomic weight is equal to the?

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


Fluorine has an atomic number of 9 and an atomic weight of 19 so how many electrons are present in an uncharged fluorine atom?

In an uncharged atom, the number of electrons is always equal to the atomic number, in this instance, 9.


What is the atomic number always equal to?

The number of protons in the nucleus of each atom that has the atomic number.


Is the atomic weight of an element is equal to the number of protons minus the number of neutrons?

Atomic weight of an element is the number of protons plus neutrons in the nucleus, atomic number is the number of protons only.


Which is always equal to the molar mass of any element?

atomic weight


What is the number of protons in an atom known as?

It is called the atomic no. of element. It is also equal to the no. of electrons in the atom.


Do neutrons always equal the number of elecrons?

Electrons are equal to the number of protons and the atomic number. To find the number of neutrons you must subtract the atomic number from the mass number.


Has a mass about the same as a proton's?

The atomic mass doesn't equal to the number of protons. The number of protons plus the number of neutrons equal to the atomic weight... DAI BI!


What atomic number always equal to the total number of?

Electrons or Protons. As they are effectively equal in no in a neutral atom.


What guantities are always equal to an elements atomic number?

Mass