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The "Atomic Number" is the number of protons in the nucleus of any atom.

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Q: Which number in the element key is the atomic number?
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Define what an element key contains?

An element key shows you the name of the element, its atomic number, its symbol, and its average atomic mass.


What does the decimal number in an element key represent?

atomic mass


What number determines what element an atom is from?

The identity of an element is determined by its atomic number. This is the number of protons it has, as well as the number of electrons it has when it's neutral. This number is unique to each element: no two elements have the same atomic number.


Is an element identified by the number of protons in its nucleus?

Yes. This is called an element's atomic number, and it is the key identifier for this element.


The atomic number determines the what?

The number of protons.


What is the term for the value that indicates the number of protons for an atom of a given element?

The atomic number is the number of protons in an atom of an element.


What does the atomic number of an element tell you about the element?

Atomic number = Number of protons


What does an element's atomic number stand for?

Atomic number is the number of protons in the atomic nuclei of the atoms of an element.


What is an element's atomic number?

An element's atomic number is the # of protons in its nucleus.


Element's atomic number tell about that element?

The atomic number tells you the number of protons in the nucleus of that element.


What does the atomic number equal of an element?

The atomic number of an element equals the number of protons in the element.


What is the atomic number of a element?

The atomic number of an element refers to the number of protons in the nucleus within the element. This is how the element is identified.