तीसरे मुख्य ऊर्जा कोष (n = 3) से संबंधित परमाणु कक्षकों (orbitals) की कुल संख्या कितनी होगी?

Which postulate of Dalton's Atomic Theory was proven incorrect by the discovery of subatomic particles?

What is the correct chemical symbol for a species containing 20 protons, 18 electrons, and 22 neutrons?

Which of the following sets of quantum numbers are permissible? (J) n = 3, ℓ = 3, m = 2, s = +12 (K) n = 2, ℓ = 2, m = 1, s = -12 (L) n = 1, ℓ = 0, m = 0, s = -12 (M) n = 3, ℓ = 2, m = 1, s = -12 Choose the correct option: