S C Kheterpal, S N Dhawan and, P N Kapil Solutions for Chapter: Classification of Elements and Periodicity in Properties, Exercise 8: TEST YOUR GRIP

The general outer shell electronic configuration of _____$(\mathrm{d}/\mathrm{s})$-block elements is $(\mathrm{n}–1){\mathrm{d}}^{1-10} {\mathrm{ns}}^{1–2}$.  $$  

All the lanthanoid and actinoids belong to Group _____ ($3/4/5$) of the periodic table.

Elements having three incomplete outermost subshells are called _____

In the periodic table, the element having the highest first ionisation enthalpy is _____.

Energy released when an electron is added to a neutral gaseous atom is called _____ enthalpy of the atom.

Among the halogens, the element having the most negative electron gain enthalpy is _____.

The electronegativity of the elements $\mathrm{C}, \mathrm{N}, \mathrm{Si}$ and $\mathrm{P}$ increases in the order _____.

An element of Group-$13$ which forms a basic oxide is _____.(Boron/Thallium)