Match the following columns: Column I Column II (i) Noble gases (a) F , C l , B r , I (ii) Transition elements (b) O , S , S e , T e (iii) Chalcogens (c) S c , T i , V , C r (iv) Halogens (d) H e , N e , A r , K r

(i) Group 18 elements are called as noble gases. The elements of this group include He , Ne , Ar and Kr . (ii) The elements present between the group 2 and group 13 in the modern periodic table are called the transition elements. They include Sc , Ti , V and Cr . (iii) The elements of group 16 are called the chalcogen family. They are also known as oxygen family. They include the elements such as O , S , Se and Te . (iv) Group 17 elements are known as halogen family. The elements such as F , Cl , Br and I are present in this group. They are highly electronegative elements. Column I Column II (i) Noble gases (d) He , Ne , Ar , Kr (ii) Transition elements (c) Sc , Ti , V , Cr (iii) Chalcogens (b) O , S , Se , Te (iv) Halogens (a) F , Cl , Br , I

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Why are the group $16$ elements called chalcogens?

Important Questions on Elements of Groups 16, 17 and 18

EASY

Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

Which of the following is not a mineral of fluorine?

HARD

Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

How is fluorine isolate from fluorides using Dennis method.

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Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

Why are the elements of Group

18

known as noble gases?

EASY

Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

Which of the following noble gases is abundant in air?

EASY

Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

Chalcogen group elements are :

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Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

Give a reason for the following:

Inert gases do not form ions.

EASY

Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

Write true or false: Group 16 elements are called halogens.

EASY

Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

The bond length of

Br - Br

{Br}_{2}

molecule is equal to

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Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

The indicator used during the estimation of

COD

of a water sample is

HARD

Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

The following table represents the elements and the atomic number. With reference to this, answer the following using only the alphabets given in the table.

Element	Atomic number
$P$	$13$
$Q$	$7$
$R$	$10$

Which element has an electron affinity zero?

EASY

Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

An element belonging to Chalcogen group is

EASY

Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

The noble gas that does not occur in the atmosphere is;

EASY

Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

The valence shell electronic structure of an element is

{ns}^{2} {np}^{5}

. The element will belong to the group of :-

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Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

The general outer electronic configuration of noble gas is

{ns}^{_{2}} {np}^{6}

. Helium, however has

1 s^{2}

configuration, rest of the inert gases have 8 electrons in their outermost valence shell. This imparts stability to the atoms of these gases. As a result of which they neither lose nor gain electrons. Consequently these gases are almost chemically inert.
Read the above passage and answer the following questions:
(i) Write the names and symbols of the elements of group 18.
(ii) Why are inert gas also called noble gases?
(iii) Neon is generally used for warning signals. Why?

EASY

Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

Chalcogens are elements of group:

MEDIUM

Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

Give a reason for the following.
Inert gases do not form ions.

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Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

What are noble gases? What is the characteristic of the electronic configuration of noble gases?

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Chemistry>Inorganic Chemistry>Elements of Groups 16, 17 and 18>Occurrence of Elements of Groups 16, 17 and 18

Chalcogens are elements of: