Mock Test 1 — Classification of Elements and Periodicity

Total elements in 4th period:

Which is the most electronegative?

Among Li, Na, K, Cs — highest 1st IE:

Ionization energy of inert gases is:

Element with $Z = 26$ belongs to:

Which is NOT isoelectronic with Na⁺?

The IE of Be is greater than B because:

Smallest atomic radius among the following:

Decreasing order of atomic radius in group 2:

The diagonal relationship between Li and Mg arises due to:

Group number of element with $Z = 38$:

Period number of element with $Z = 19$:

Number of valence electrons in N ($Z = 7$):

Assertion (A): The atomic size of noble gases is largest in their respective period. Reason (R): They are reported using van der Waals radius (non-bonded radius), which is larger than covalent radius.

Assertion (A): The first ionization energy of nitrogen is greater than that of oxygen. Reason (R): Nitrogen has half-filled $2p^3$ which is extra stable.