Give NCERT top priority because practically all exam questions are derived from NCERT examples and text. Concentrate on heavier subjects like thermodynamics, organic chemistry, hydrocarbons, and ...

Students use the terms isotope, atomic number, mass number, and atomic mass. Atomic Theory: Structure of the Atom: Students use the terms isotope, atomic number, mass number, and atomic mass to ...

The number of atoms in 0.1 mol of a triatomic gas is: The empirical formula of a compound is CH₂O. If its molar mass is 180 g/mol, what is its molecular formula?

The Bohr model, introduced by Danish physicist Niels Bohr in 1913, was a key step on the journey to understand atoms. Ancient Greek thinkers already believed that matter was composed of tiny basic ...