A Karachi chemistry tutor asks who turned scattered element notes into periodic gaps that later elements filled like missing puzzle slots. Classroom priority usually awards systematic periodic-law credit with predictive gaps narratives to whom?
Q1. A Karachi chemistry tutor asks who turned scattered element notes into periodic gaps that later elements filled like missing puzzle slots. Classroom priority usually awards systematic periodic-law credit with predictive gaps narratives to whom?
Answer: Dmitri Ivanovich Mendeleev
Explanation: Dmitri Mendeleev published his periodic table in 1869, arranging elements by atomic mass and leaving deliberate gaps for undiscovered elements whose properties he predicted; subsequent discoveries of gallium, scandium, and germanium closely matched his forecasts, validating the periodic law.