✓✗The experiments that showed atomic number to be the fundamental property of an element were done by

✓✗Noble gases belong to group

✓✗Which oxide is the most acidic?

✓✗Which of the following statements are true?
A. Unlike Ga, which has a very high melting point, Cs has a very low melting point.
B. On the Pauling scale, the electronegativity values of N and Cl are not the same.
C. Ar, K⁺, Cl⁻, Ca²⁺ and S²⁻ are all isoelectronic species.
D. The correct order of the first ionisation enthalpies of Na, Mg, Al and Si is Si > Al > Mg > Na.
E. The atomic radius of Cs is greater than that of Li and Rb.
Choose the correct answer from the options given below:

✓✗Statement I: Element 113 is expected to be a p-block element of group 13.
Statement II: Element 113 has the outer configuration 7s² 7p¹.

✓✗The formation of the oxide ion, O_(g)²⁻, from an oxygen atom requires first an exothermic and then an endothermic step:
O_(g) + e⁻ → O_(g)⁻; ΔH° = −141 kJ mol⁻¹
O_(g)⁻ + e⁻ → O_(g)²⁻; ΔH° = +780 kJ mol⁻¹
Thus, the formation of O²⁻ in the gas phase is unfavourable even though O²⁻ is isoelectronic with neon. This is due to the fact that

✓✗The Mulliken electronegativity of an element with IE = 13.0 eV and EA = 3.6 eV is

✓✗Identify the wrong statement.

✓✗The correct order of size is

✓✗Which of the following is a p-block element?

✓✗The element with the most metallic character among Na, Mg, Al and Si is

✓✗Lanthanoids are placed separately at the bottom of the periodic table because

✓✗Assertion: Elements in the same group show similar chemical properties.
Reason: They have similar outer electronic configurations.

✓✗The IUPAC name of an element with atomic number 119 is

✓✗Which electronic configuration of an element has an abnormally high difference between the second and third ionisation energies?