Question

name the motion of electrons around the nucles

Answer 1

orbital motion (quantum)

Answer 2

The electrons are negatively ( – ve ) charged particles , They revolve around the nucleus with very high speed , The electron has a negligible mass relative to that of the proton or the neutron , so the mass of the atom is concentrated in the nucleus .

The number of the negative electrons which revolve around the nucleus is equal to the number of positive protons in the nucleus , so the atom is electrically neutral in its ordinary state .

The atomic number = the number of the protons = the number of the electrons .

The mass number = the number of the protons ( the atomic number ) + the number of neutrons .

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