They are determined by the number of protons in their nucleus.
by atomic number
Number of protons in the nucleus (=atomic number)
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You think probable to atomic number, equal to the number of protons in the atomic nucleus.
You need to clarify this question. Do you mean, "How is the number of protons determined in the periodic table of the elements?"
Moseley determined that the number of protons in the nucleus of an atom corresponds to the element's atomic number. This discovery led to the modern periodic table where elements are arranged in increasing atomic number.
No, chemical properties of elements are primarily determined by the number of protons in the nucleus, which determines the element's atomic number and thus its placement on the periodic table. Neutrons play a role in determining an element's stability and isotopic composition but do not significantly impact its chemical behavior.
An element can be identified by the number of protons in the nucleus of its atoms.
Yes, it is the atomic number i.e. number of protons that determines an element's identity.
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.
Elelments are determined by the amount of protons they have. While different elements can have the same number of neutrons and protons, no two different elements can have the same amount of protons.