Atomic Structure and Periodicity
JUPEB Chemistry

An atom of chlorine is represented as $^{35}_{17}\text{Cl}$. How many neutrons does it contain?

The electron configuration of sodium (atomic number 11) in its ground state is

Isotopes of the same element differ in their

Chlorine consists of 75% of the isotope $^{35}\text{Cl}$ and 25% of $^{37}\text{Cl}$. Calculate its relative atomic mass.

An element has the electron configuration $1s^2 2s^2 2p^6 3s^2 3p^5$. In which group of the Periodic Table is it found?

Across a period from left to right in the Periodic Table, the atomic radius generally

Which of the following elements has the highest first ionisation energy?

How many orbitals are there in the third principal energy level (n = 3)?

The maximum number of electrons that can occupy a d subshell is

Which of the following species has 10 electrons? (Atomic numbers: Na = 11, Mg = 12, Al = 13, Cl = 17)

Which of the following elements is the most electronegative?

The electron configuration of the Fe$^{3+}$ ion (iron, atomic number 26) is