Classification of elements and periodicity in properties practice · Mixed difficulty

The first ionization energy of magnesium is smaller as compared to that of elements $X$ and $Y$, but higher than that of $Z$. The elements $X$, $Y$ and $Z$, respectively, are

In Mendleev's periodic table some pairs of elements do not follow increasing order of atomic weight known as anomolous pair. The correct example of anomolous pair is

The order of stability of metal oxides is

In which block does 106th element belong?

Statement I: $F$ is more electronegative than $Cl.$

Statement II: $F$ has high electron affinity than $Cl.$

According to the Periodic Law of elements, the variation in properties of elements is related to their

Which one of the following has maximum ionisation potential?

Among the statements (I-IV), the correct ones are:
I) $Be$ has smaller atomic radius compared to $Mg$
II) $Be$ has higher ionisation enthalpy than $Al$
III) Charge/radius ratio of $Be$ is greater than that of $Al$
IV) Both $Be$ and $Al$ form mainly covalent compounds.

The electronic configuration of four elements are

(i) $[\mathrm{Xe}] 5 s^1$

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

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

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

Select the incorrect statement about these elements.

Electronic configurations of four elements A, B, $\mathrm{C}$ and $\mathrm{D}$ are given below :

(i) $1 s^2 2 s^2 2 p^6$

(ii) $1 s^2 2 s^2 2 p^4$

(iii) $1 s^2 2 s^2 2 p^6 3 s^1$

(iv) $1 s^2 2 s^2 2 p^5$

Which of the following is the correct order of increasing tendency to gain electron?

Anomalous pair among the following is

An element, which belongs to third period and group 16 in the periodic table has electronic configuration.

If ionization potential for hydrogen atom is 13.6 eV, then ionization potential for $L{i^{ + 2}}$ will be:

Assertion (A): $\mathrm{Be}$ and $\mathrm{Al}$ show some similar properties.
Reason (R): The metallic radius of $\mathrm{Be}$ is less than the metallic radius of $\mathrm{Al}$.

Assertion (A): In a triad, the three elements present have different gaps of atomic masses.

Reason (R): Elements in a triad have different properties.

The correct electronegativity order is:

The ionisation energy will be maximum for the process:

Eka aluminum and Eka silicon are known as

Periodic classification of elements is used to examine the

Which of the following is general electronic configuration of representative elements

The general electronic configuration of the transition elements is

Which one of the following is not a transition metal

Atomic radii of fluorine and neon in angstrom unit are respectively given by:

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

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

Which of the scientists given below discovered that periodic table should be based on the atomic number?

The electron affinity of chlorine is $3.7 \mathrm{eV} .1$ gram of chlorine is completely converted to $\mathrm{Cl}^{-}$ion in a gaseous state. $\left(1 \mathrm{eV}=23.06 \mathrm{~kcal} \mathrm{~mol}^{-1}\right)$.
Energy released in the process is

Identify the least stable ion amongst the following:

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

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The ionic radii of ${O^{2 - }}$ and $M{g^{2 + }}$ are same.
Reason: Both ${O^{2 - }}$ and $M{g^{2 + }}$ are isoelectronic species.
In the light of the above statements, choose the correct answer from the options given below.

Which of the following transitions involves maximum amount of energy?