The atomic number is denoted by the symbol ‘Z’.
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The atomic number represents the number of protons present in the nucleus of an atom.
All atoms of the same element have the same atomic number because the number of protons determines the element’s identity and chemical properties. Any change in the number of protons would result in a different element.
The atomic number varies across different elements, with each element having a unique atomic number that corresponds to the number of protons in its nucleus.
The atomic number of hydrogen is 1 because each hydrogen atom contains one proton in its nucleus.