Classification of Elements and Periodicity in Properties

The root word 'bi' in IUPAC naming represents which digit?

Which block of the periodic table contains the most reactive metals?

Which period contains 18 elements?

What is the atomic number of the element placed in Period 2 and Group 14?

To which group does an element with the configuration $ns^2 np^6$ belong?

The d-block elements are also known as:

Which property of an element is most closely related to its chemical reactivity?

Across the 2nd period, as atomic number increases, the atomic radius generally:

Which of the following elements belongs to the 4th period?

As we move across the 4th period from $K$ to $Kr$, what is the general trend in atomic radius?

Which of the following atoms has the highest effective nuclear charge ($Z_{eff}$) for its valence electrons in Period 3?

Which of the following ions is the largest in size?

Which of the following ions is isoelectronic with $Ne$?

In the comparison between $Cu^+$ and $Cu^{2+}$, which ion is smaller?

Which of the following has the smallest ionic radius?

Removal of an electron from which of the following species would require the most energy?

Which of the following is true for an isolated gaseous atom?

Across the second period, the general trend of ionization enthalpy is:

Which of the following elements will release the most energy when a gaseous atom accepts an electron?

Which physical state of an atom is required to measure its electron gain enthalpy standardly?

As we move from Na to Cl in the third period, the electron gain enthalpy generally:

Which of the following elements has an electronegativity of 2.5 on the Pauling scale?

As the positive charge on a cation increases, its electronegativity:

In the periodic table, diagonal relationships exist. Which element has an electronegativity close to that of Aluminium ($1.5$)?