Periodic Table and Periodicity

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The first ionization enthalpy of O is lower than that of N and F .
Reason R: The loss of an electron from O leads to stable h...

Among the following options, the correct trend in the electron gain enthalpy is

Identify the incorrect statement from the following :

The correct order of increasing metallic character of $\mathrm{Na}, \mathrm{Be}, \mathrm{P}, \mathrm{Mg}$ and Si is

Which among the following electronic configurations belong to main group elements?
A. $[\mathrm{Ne}] 3 \mathrm{~s}^1$
B. $[\operatorname{Ar}] 3 \mathrm{~d}^3 4 \mathrm{~s}^2$
C. $[K r] 4 d^{10} 5 s^2 5 p^5$
D. $[\operatorname{Ar}] 3 \mathrm...

Which of the following statements are true?
A. Unlike Ga that has a very high melting point, Cs has a very low melting point.
B. On Pauling scale, the electronegativity values of N and Cl are not the same.
C. $\mathrm{Ar}, \mathrm{K}^{+}, \...

Match List I with List II :

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The correct decreasing order of atomic radii (pm) of \(\mathrm{Li}, \mathrm{Be}, \mathrm{B}\) and \(\mathrm{C}\) is

Arrange the following elements in increasing order of electronegativity:
N, O, F, C, Si
Choose the correct answer from the options given below :

Arrange the following elements in increasing order of first ionization enthalpy:
\(\mathrm{Li}, \mathrm{Be}, \mathrm{B}, \mathrm{C}, \mathrm{N}\)
Choose the correct answer from the options given below:

The correct sequence given below containing neutral, acidic, basic and amphoteric oxide each, respectively, is

Which of the following is correctly matched?

If first ionization enthalpies of elements X and Y are 419 kJ mol\(-\)1 and 590 kJ mol\(-\)1, respectively and second ionization enthalpies of X and Y are 3069 kJ mol\(-\)1 and 1145 kJ mol\(-\)1, respectively. Then correct statement is :

Fluorine is a stronger oxidising agent than chlorine because :
(a) F-F bond has a low enthalpy of dissociation.
(b) Fluoride ion (F\(-\)) has high hydration enthalpy.
(c) Electron gain enthalpy of fluorine is less negative than chlorine.
(d...

Decrease in size from left to right in actinoid series is greater and gradual than that in lanthanoid series due to

The correct order of first ionization enthalpy for the given four elements is :

Gadolinium has a low value of third ionisation enthalpy because of

The IUPAC name of an element with atomic number 119 is

Match the following :



Oxide


Nature




(A)
CO
(i)
Basic


(B)
BaO
(ii)
Neutral


(C)
Al2O3
(iii)
Acidic


(D)
Cl2O7
(iv)
Amphoteric


W...

Identify the incorrect match.


Name


IUPAC Official Name




(A)
Unnilunium
(i)
Mendelevium


(B)
Unniltrium
(ii)
Lawrencium


(C)
Unnilhexium
(iii)
Seaborgium
...

For the second period elements the correct increasing order of first ionization enthalpy is :

Which of the following oxides is most acidic in
nature?

The correct order of atomic radii in group 13
elements is

The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration ?

In which of the following options the order of arrangement does not agree with the variation of property indicated against it ?

The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase ?

Which of the following orders of ionic radii is correctly represented ?

Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O?

Identify the wrong statement in the following.

What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?

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

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and C\(l\) ?

Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is

Among the following which one has the highest cation to anion size ratio ?

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

Which one of the following arrangements does not give the correct picture of the trends indicated against it ?

Identify the correct order of the size of the following :

Which one of the following ionic species has the greatest proton affinity to form stable compound ?

With which of the following electronic configuration an atom has the lowest ionisation enthalpy ?

Which one of the following orders is not in accordance with the property stated against it ?

Which one of the following orders is not in accordance with the property stated against it?

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species ?

Ionic radii are

The ions O2\(-\), F\(-\), Na+, Mg2+ and Al3+ are isoelectronic. Their ionic radii show

Which of the following order is wrong?

Correct order of 1st ionization potential among following elements Be, B, C, N, O is

Which statement is wrong ?