What is the approximate mass of the precipitate formed when $50$ mL of $16.9\%$ solution of $\text{AgNO}_3$ is mixed with $50$ mL of $7.45\%$ KCl solution? (Molar mass of $\text{AgNO}_3 = 169$ g/mol, KCl $= 74.5$ g/mol, AgCl $= 143.3$ g/mol)

Calculate the de Broglie wavelength of an electron in the first Bohr orbit of a hydrogen atom if the velocity of an electron in the first orbit is $2.2 \times 10^6 \text{ ms}^{-1}$. [mass of electron $= 9.1 \times 10^{-31}$ kg, plank's constant (h) $= 6.626 \times 10^{-34}$ J s]

Which group elements have the smallest atomic radii in their respective periods?

What happens to the size of atoms in p-block elements when we move from left to right in the same period?