Match the element in column I with that in column II. Column-I Column-II (a) Copper (p) Non-metal (b) Fluorine (q) Transition metal (c) Silicon (r) Lanthanoid (d) Cerium (s) Metalloid Identify the correct match :

(a)-(q), (b)-(p), (c)-(s), (d)-(r)

(a)-(q), (b)-(s), (c)-(p), (d)-(r)

(a)-(s), (b)-(r), (c)-(p), (d)-(q)

(a)-(p), (b)-(q), (c)-(r), (d)-(s)

MEDIUM

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The last electron of the element $X$ has quantum numbers $n = 2, l = 1, m = - 1, s = - \frac{1}{2} .$ The position of $X$ in the periodic table is

(Assume that while filling the degenerate orbitals in the given sub-shell, orbital with $m = - 1$ is filled at the end. Also, the electrons having $s = + \frac{1}{2}$ are filled first.)

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Important Questions on Classification of Elements and Periodicity in Properties

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

The last element of the

p

- block in

6^{th}

period is represented by the outermost electronic configuration:

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

The set that contains atomic numbers of only transition elements, is :

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

Which of the following does not exist?

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

An element of atomic number

118

would be a/an __________

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

The element

Z = 114

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

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

Which among the following elements is a metalloid?

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

Consider the following radioactive decays

I. ${}_{92}U {\overset{- α}{⟶}}_{90} Th$ and

II. $_{90} Th \overset{- α}{⟶} {}_{88}{Ra}$

In which case group of parent and daughter elements remains unchanged.

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

The electron configuration of

F e^{3 +}

is (atomic number of

F e = 26

)

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

The electronic configurations of bivalent europium and trivalent cerium are:
(atomic number:

X e = 54

C e = 58

E u = 63)

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

The correct match among the following is

(a) Lithium, Sodium, Potassium (i) Alkaline earth metals
(b) Beryllium, Magnesium, Calcium (ii) Semi-metals
(c) Oxygen, Sulphur, Selenium (iii) Alkali metaIs
(d) Silicon, Germanium, Arsenic (iv) Chalcogens

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

To which group of the periodic table does an element having electronic configuration

[Ar] 3 d^{5} 4 s^{2}

belong?

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

The electronic configurations of Eu (Atomic no.

63

), Gd (Atomic no.

64

) and Tb (Atomic no.

65

) are:

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

Among the given configurations, identify the element which doesn't belong to the same family as the others?

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

Decrease in ionic size in a period is observed in

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

The element with outer electronic configuration

(n - 1) d^{2} n s^{2}

, where

n = 4

, would belong to

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

Match the element in column I with that in column II.

	Column-I		Column-II
(a)	Copper	(p)	Non-metal
(b)	Fluorine	(q)	Transition metal
(c)	Silicon	(r)	Lanthanoid
(d)	Cerium	(s)	Metalloid

Identify the correct match :

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

Which of the following species is iso-electronic with

Cr ?

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

The elements with atomic numbers

101

and

104

belong to, respectively:

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

The

71^{st}

electron of an element

X

with an atomic number of

71

enters the orbital:

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements

Scandium is a transition element. But zinc is not. Why?

The last electron of the element X has quantum numbers n=2, l=1, m=-1, s=-12. The position of X in the periodic table is (Assume that while filling the degenerate orbitals in the given sub-shell, orbital with m=-1 is filled at the end. Also, the electrons having s=+12 are filled first.)

Important Questions on Classification of Elements and Periodicity in Properties

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