परमाणु भार को निर्धारित करने के लिए किस समस्थानिक को अंतर्राष्ट्रीय मानक माना गया 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: