Classification of elements and periodicity in properties practice · Mixed difficulty

The second ionization enthalpies of elements are always higher than their first ionization enthalpies because:

S-I: The second ionisation energy of '$O$' is greater than that of '$N$'.

S-II: The half filled p-orbitals cause greater stability.

Atomic number of element Ununnillium is

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

The element having maximum value for its $3^{\text {rd }}$ ionisation enthalpy is

For the alkali metals, which of the following increase with increasing atomic number

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 consequence of high screening effect of inner electrons of the nucleus for an element “X” 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?

A dipositive ion has number of ${e^ - }$ equal to 24 and mass number 56, the number of neutrons present is

On which of the following Dobereiner's Triad law is not applicable?

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

The atomic number of element Unp is

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.

IUPAC name of element having atomic number 108 is

The electronic structure $(n-1) d^{1-10} n s^{0-2}$ is characteristic of

The electronic configurations of four elements are :

(i) $[{Xe}] 6 s^1$

(ii) $[{Xe}] 4 f^{14} 5 d^1 6 s^2$

(iii) $[{Ar}] 4 s^2 4 p^5$

(iv) $[{Ar}] 3 d^7 4 s^2$

Which one of the following statements about these elements is not correct?

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

The energy required to convert all atoms present in $1.2 \mathrm{~g}$ magnesium to ${Mg}^{2+}$ ions if $\mathrm{IE}$, and $\mathrm{IE}_2$ of magnesium are $120 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $240 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively

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

The correct order of electronegativity of N, O, F and P is

$B$ 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 element having greatest difference between its first and second ionisation energy, is