Question

what is an atomic nimber ? state its characteristic​

Answer 1

The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus. In an uncharged atom, the atomic number is also equal to the number of electrons. The sum of the atomic number Z and the number of neutrons N gives the mass number A of an atom

Answer 2

किसी रसायनिक तत्व के नाभि (केंद्र) में स्‍थित, घनात्‍मक विद्युत आवेश वाले प्रोटोनों की संख्‍या; परमाणु संख्‍या

the number of protons that a chemical element has in its centre (nucleus)