Classification of elements and periodicity in properties practice · Easy

Which element has the highest electronegativity?

Arrange the following in increasing order of ionic radii? ${C}^{4-}, {N}^{3-}, {F}^{-}, {O}^{2-}$

If Aufbau rule is not followed, K-19 will be placed in

Which one of the elements has the maximum electron affinity?

Correct order of screening effect for electrons present in different sub shell will be :

Four elements are given, choose the correct order of their first ionisation potential :

a. $1 s^2, 2 s^2 2 p^6 3 s^1$

b. $1 s^2, 2 s^2 2 p^6 3 s^2 3 p^6$

c. $1 s^2, 2 s^2 2 p^6 3 s^2 3 p^2$

d. $1 s^2, 2 s^2 2 p^6 3 s^2 3 p^1$

The discovery of which of the following group of elements gave death blow to the Newland’s law of octaves?

Pauling’s electronegativity scale is based upon experimental values of

Which of the following is a false statement?

Which of the following compounds is/are amphoteric in nature?

Order of atomic radii of $\mathrm{Ti},\,\mathrm{Zr}$ and $\mathrm{Hf}$ is:

Mendeleef’s Periodic Table is upset by the fact that

The starting element of fifth period is

The first four ionisation energy values of an element are 191, 578, 872 and 5962 kcal. The number of valence electrons in the element is

Number of elements presents in the fifth period of periodic table is

Although electron gain enthalpy of fluorine is less negative as compared to chlorine, fluorine is a stronger oxidising agent then chlorine. This is attributed to

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

At present, how many elements are known

The incorrect order is

Elements having similar outer shell electronic configuration in their atoms are arranged in

Electronegativity refers to the tendency of atom to

Read the following three statements and choose the correct option. Here $\mathrm{T}$ stands for true and $\mathrm{F}$ stands for false statement.

(i) Boron has a smaller first ionization enthalpy than beryllium.

(ii) Nitrogen has smaller first ionization enthalpy than oxygen.

(iii) The first ionization enthalpy increases across a period.

The electron configuration of an element ‘M’ is $\left[ {Ar} \right]\,\,3{d^{10}}4{s^2}4{p^3}.$ Then ‘M’ belongs to

Atomic number 116 is written in IUPAC as

The element with atomic number 36 belongs to …block in the Periodic Table.

In which of the following species ${2^{nd}}I.E\mathrm{ } < \mathrm{ }{1^{st}}I.E$

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

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

The factors that influence ionisation energies are

Of the following pairs, the one containing examples of metalloid elements is :

The charges on the colloidal $CdS$ sol and $Ti{O_2}$ sol are, respectively