The element with atomic number $117$ if discovered would be placed in

Important Questions on Classification of Elements and Periodicity in Properties

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 19

Which of the following pairs contain metalloid elements in the periodic table ?

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 20

Among the elements from atomic number $1$ to $36$, the number of elements which have an unpaired electron in the $\mathrm{s}$-subshell is

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 21

 The number of $\mathrm{d}$-electrons in ${\mathrm{Fe}}^{2+} (\mathrm{Z} = 26)$ is not equal to the number of electrons in which one of the following?

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 22

The atom of the smallest atomic radius among the following is

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 23

Among the elements $\mathrm{Ca}, \mathrm{Mg}, \mathrm{P}$ and $\mathrm{Cl}$,  the order of increasing atomic radii is

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 24

Identify the wrong statement in the following :

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 25

The ionic radii (in${\mathrm{A}}^{°}$) of ${\mathrm{N}}^{3-}, {\mathrm{O}}^{2-}$and ${\mathrm{F}}^{-}$are respectively

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 26

The species $\mathrm{Ar}, {\mathrm{K}}^{+}$and ${\mathrm{Ca}}^{2+}$ contain the same number of electrons. In which order do their radii increase?