Classification of elements and periodicity in properties practice · Easy

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

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?

The atomic number of element Unp is

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 electronegativity of N, O, F and P is

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

......... is measured as the radius of an atom's core which is in contact with the core of an adjacent atom in a bonded situation.

Which of the following is a transition element?

Which of the following set of elements cannot be a triad

Correct statements among the following is /are:-

The number of elements which can be accommodated in the present set-up of the long form of the periodic table is:

The element with electronic configuration $1{s^2}2{s^2}2{p^6}3{s^2}$ is

Which of the following is the correct order of electron gain enthalpy

Which important property did Mendeleev use to classify the elements in his periodic table?

If the ionisation potential is IE, electron affinity is EA and electronegativity is X, which of the following relation is correct

When an electron is removed from an atom, its energy

Which among the following is a representative element?

Observe the following statement VIII. The physical and chemical properties of elements are periodic functions of their electronic configuration. IX. Electronegativity of fluorine is less than the electronegativity of chlorine. X. Electropositive nature decreases from top to bottom in a group. The correct answer is

The first ionisation potential is maximum for :

Which group of the periodic table contains all the three (gas, liquid and solid) type of element :

Maximum number of orbitals in $3^{\text {rd }}$ excited state of $L i^{+2}=x$. Electronegativity (Pauling scale) of most electronegative element $=y$. Then find value of $\left(\frac{x}{y}\right)$.

Which of the following is arranged in decreasing order of size?

Which of the following electronic configuration in the outermost shell is characteristic of alkali metals

Correct order of second I . P is

Assertion: In a period on going left to right Ionisation energy decrease.
Reason: In a period on moving left to right nuclear charge outweighs the shielding.

The stable oxidation state of thallium, a $II{I_A}$ ______ group element is

The elements which are characterized by the outer shell configurations $n{s^{1 - 2}}$ to $n{p^{1 - 5}}$ are collectively called