निम्नलिखित में से किस परमाणु की मूल अवस्था (ground state) में दो अयुग्मित इलेक्ट्रॉन (unpaired electrons) होते हैं और इसलिए वह अनुचुंबकीय (paramagnetic) होता है?

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: