Chemistry
State what is meant by the terms :
(i) subatomic particles,
(ii) nucleus,
(iii) orbits,
(iv) atomic number
(v) mass number with reference to an atom.
Answer
(i) Subatomic particles : The particles into which an atom is divided (i.e., protons, electrons, neutrons) are called the subatomic particles.
(ii) Nucleus : The centre or the nucleus of the atom is the place where the protons and neutrons are found.
(iii) Orbits : The electrons revolve around the nucleus along imaginary paths known as shells or more accurately orbits or orbitals.
(iv) Atomic number : Number of protons or number of electrons present in an atom. [Z]
(v) Mass number [A] : The Mass number of an atom is the total number of protons and neutrons collectively called nucleons in the nucleus of the atom.
Related Questions
State the experimental proofs which led to the discovery of –
(i) Electrons
(ii) Protons
(iii) atomic nucleus
(iv) neutrons.
State the drawbacks of Rutherford's atomic model correlating them with the postulates of Bohr's atomic model.
An element 'A' has mass number 23 and atomic number 11. State the —
(i) no. of neutrons in it's shell,
(ii) electronic configuration of the element 'A'.