textbook exercises

Why do ${}_{17}{}^{35}\mathrm{Cl}$ and ${}_{17}{}^{37}\mathrm{Cl}$ have the same chemical properties? In what respect do these atoms differ?

Draw the structure of oxygen and sulphur atoms.

Calculate the number of neutrons, protons and electrons of the element with atomic number $3$ and mass number $7$.

Calculate the number of neutrons, protons and electrons of the element with atomic number $92$ and mass number $238$ .

What are nucleons? How many nucleons are present in Phosphorous? Draw its structure.

What conclusions were made from the observations of Gold foil experiment?

Explain the postulates of Bohr’s atomic model.

State the Gay Lussac’s law of combining volumes. Explain with an illustration.