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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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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


What is the atomic number always equal to?

The atomic number reflects the charge number of the nucleus. It is always equal to the number of protons found in the nucleus.


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

No, the atomic weight of an element is not equal to the number of protons minus the number of neutrons. Atomic weight is the average weight of an element's isotopes taking into account their abundance, which includes the sum of the protons and neutrons in the nucleus.


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.


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.


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

The atomic mass of an element is equal to its molar mass in grams/mol.


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.


How do you get the atomic number and weight?

The atomic number of an element is equal to the number of protons in its nucleus. The atomic weight is the average mass of an element's isotopes, taking into account their relative abundance. Both the atomic number and weight can be found on the periodic table for each element.


What guantities are always equal to an elements atomic number?

Mass