Newlands proposed an early octave pattern and Mendeleev left gaps for undiscovered elements. What did Moseley’s work later make the reliable organizing number for the long-form table?
Q1. Newlands proposed an early octave pattern and Mendeleev left gaps for undiscovered elements. What did Moseley’s work later make the reliable organizing number for the long-form table?
Answer: Atomic number
Explanation: Henry Moseley showed in 1913 that bombarding elements with X-rays revealed a unique atomic number (proton count) for each element; arranging elements by atomic number resolved anomalies in Mendeleev's mass-based table and became the reliable organising principle of the modern periodic table.