Define atomic number
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The number of protons and electrons normally found in an atom of a given chemical element.
uday157:
sorry not electron because in case of ion ----H- no. of proton =1 and no. of electron =2
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Answer:
Explanation:
Atomic number is the number of protons in the atom. It is the characteristic of a particular element.
Note: Protons are not responsible for the chemical properties of the element, but the number of electrons. Since during a reaction, an atom may gain or lose electrons, we use the equal of number of electrons, i.e. number of protons.
For example, the atomic number of hydrogen is 1, since it has 1 proton. The atomic number of oganesson is 118, since it has 118 protons.
The periodic table arranges the element in order of atomic number.
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