Classification of elements and periodicity in properties practice · Medium

Atomic number of element Ununnillium is

Which among the following elements has lowest value of ionisation energy?

Assertion :- $\mathrm{Zn}$ is not a transition element whereas $\mathrm{SC}$ is.

Reason :- Configuration of $\mathrm{Zn}$ is $4 \mathrm{s}^2, 4 \mathrm{p}^0, 4 \mathrm{d}^0.$

Correct relationship for compound $\mathrm{A}^{-\delta}-\mathrm{B}^{+\delta}$ is :-

The correct order of the decreasing ionic radii among the following is electronic species are

Element having atomic no. of 56 belongs to which of the following block of periodic table?

Predict the correct formula of compounds, by the following pair of elements like aluminium and sulphur with the help of oxidation states,

Elements having six electrons in its outermost orbit generally form:

Assertion: Electron gain enthalpy can be exothermic or endothermic.
Reason: Electron gain enthalpy provides a measure of the ease with which an atom adds an electron to form anion.

Element with which of the following atomic number was named by American Society as Rutherfordium, while by Soviet Society it was named as Kurchatovium?

The set that represents the pair of neutral oxides nitrogen is

Electronic configuration of four elements A, B, C and D are given below.
A) $1{S^2}2{S^2}2{P^6}$ B) $1{S^2}2{S^2}2{P^4}$ C) $1{S^2}2{S^2}2{P^6}3{S^1}$ D) $1{S^2}2{S^2}2{P^5}$
Which of the following is the correct order of increasing tendency to gain electron.

The correct order of ionisation energies of ${F}^{-}, {Cl}^{-}, {F}$ and ${Cl}$ is:

Amongst the elements with following electronic configurations, which one of them may have the highest ionization energy?

$B$ has a smaller first ionisation enthalpy than $Be$. Consider the following statements :

I) It is easier to remove $2p$ electron than $2s$ electron

II) $2p$ electron of $B$ is more shielded from the nucleus by the inner core of electrons than the $2s$ electrons of $Be$

III) $2s$ electron has more penetration power than $2p$ electron
IV) atomic radius of $B$ is more than $Be$ (atomic number $B = 5$, $Be = 4$)
The correct statements are

Correct order of increasing ionic radii is

The electron affinity of $K_{(g)}^ +$ ion is numerically equal to

Among $\mathrm{Zn}(\mathrm{OH})_2, \mathrm{Sn}(\mathrm{OH})_2, \mathrm{Cu}(\mathrm{OH})_2, \mathrm{Fe}(\mathrm{OH})_3, \mathrm{~Pb}(\mathrm{OH})_2, \mathrm{Al}(\mathrm{OH})_3$
The number of hydroxides which are soluble in excess of $\mathrm{NaOH}$ solution is

The correct order of ionisation energy is

Which of the following statement is incorrect?

Which one of the following elements has the highest ionisation energy?

The atomic orbitals used for filling in sixth period of periodic table are

Identify the wrong statement in the following.

Which of the following order is correct?
A) $N{H_3} < P{H_3} < As{H_3}$ (Reducing nature)
B) $Na > Mg > Al > Si$ (Radius)
C) $Li < Be < B < C\left( {\mathrm{I}\mathrm{.}{\mathrm{E}_1}} \right)$
D) $O < F < S < Cl\,\,\,(EA)$

Lothar Meyer plotted the physical properties such as atomic volume, melting point and ...$X$... against atomic weight. Here, ${X}$ refers to

Screening by inner electrons will be more effective in

Which of the following is incorrect?

Assertion :- ${H}_2 {Se}$ is less acidic than ${H}_2 {S}.$

Reason :- $S$ is less electronegative than $Se.$

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?

Given below are two statements :
Statement (I) : Both metal and non-metal exist in p and d-block elements
Statement (II) : Non-metals have higher ionisation enthalpy and higher electronegativity than the metals.
In the light of the above statements, choose the most appropriate answer from the option given below: