Question

Define atomic number. Why is it called the main characteristic property of the elements?​

Answer 1

Explanation:

the number of protons that a chemical element has in its centre (nucleus) is called atomic number.

The atomic number (Z) of an element is the number of protons in the nucleus of each atom of that element. ... This means that the number of protons is the characteristic which makes each element unique compared to all other elements. Elements are different because of their atomic number.

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Answer 2

Answer:

Atomic number is a more fundamental property of an element than its atomic mass. On arranging elements in the increasing order of their atomic numbers, similarities appear in physical and chemical properties at regular intervals. Atomic number is equal to number of protons in an atom.