Periodic Classification of Elements

Consider the following elements. Which of the following is/are true about ${A}^{'}, {B}^{'}, {C}^{'}$ and ${D}^{'}$ ? A. Order of atomic radii: ${B}^{'} B. Order of metallic character : ${B}^{'} C. Size of the element :…

The increasing order of the atomic radii of the following elements is: $\left(a\right)C$ $\left(b\right)O$ $\left(c\right)F$ $\left(d\right)Cl$ $\left(e\right)Br$

The electronic configuration with the highest ionization enthalpy is:

Match List$-I$ with List $-\mathrm{II}$ : List $-I$ List$-\mathrm{II}$ $\left(a\right)$ $\mathrm{NaOH}$ $\left(i\right)$ Acidic $\left(b\right)$ $\mathrm{Be}(\mathrm{OH})_{2}$ $\left(\mathrm{ii}\right)$ Basic…

The correct sequence of electron gain enthalpy of the elements listed below is A. ArB. BrC. FD. S Choose the most appropriate from the options given below:

Match List-I with List-II List-I List-II (A) $\mathrm{Cl}_{2}O_{7}$ (I) Amphoteric (B) $\mathrm{Na}_{2}O$ (II) Basic (C) $\mathrm{Al}_{2}O_{3}$ (III) Neutral (D) $N_{2}O$ (IV) Acidic Choose the correct answer from the…

If IUPAC name of an element is "Unununnium" then the element belongs to nth group of periodic table. The value of $n$ is _______.

Identify the elements $X$ and $Y$ using the ionization energy values given below : $\begin{matrix} & \mathrm{Ionization}\mathrm{energy} & (\mathrm{kJ}/\mathrm{mol}) \\ & 1^{\mathrm{st}} & 2^{\mathrm{nd}} \\ X & 495 &…

Which of the following statements arenotcorrect? A. The electron gain enthalpy of $F$ is more negative than that of$\mathrm{Cl}.$ B. Ionization enthalpy decreases in a group ofperiodic table. C. The electronegativity of…

Match List-I with List-II.List-I Electronic configuration of neutral atom (where $n=2$)List-II $1^{st}$ Ionization Energy (kJ mol$^{-1}$)A. $ns^2$I. $2080$B. $ns^2np^1$II. $899$C. $ns^2np^3$III. $800$D. $ns^2np^6$IV.…

Which of the following atoms has the highest first ionization energy?

Match List - I with List - II LIST-I (Atomic number) LIST-II (Block of periodic table) (A) $37$ I. $p$-block (B) $78$ II. $d$-block (C) $52$ III. $f$-block (D) $65$ IV. $s$-block Choose the correct answer from the…