Name the following element: A trivalent metal used to make light tools.

Trivalent metals are placed in group thirteen. These metals have three electrons that can be given off to attain stability. Aluminium is the trivalent metals that has low density and is used to make light tools. Duralumin an alloy of aluminium and copper is lightweight and strong enough to make the body of the aircraft.

Name the following element: An alkaline earth metal present in group 2 and period 3 .

An alkaline earth metal that is present in group two has valency 2 , and as it is present in period third it has three shells in its atom. Its electronic configuration is 2 , 8 , 2 , hence its atomic number is 12 . The metal is magnesium.

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The group $16$ elements are also known as pnictogens.

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Important Questions on Elements of Groups 16, 17 and 18

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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?

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.

MEDIUM

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?

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

The alkaline earth metal sulphate, which has its hydration enthalpy greater than its lattice energy is

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

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.

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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.

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

H_{3} {PO}_{2}

and

H_{3} {PO}_{3}

, the numbers of

P - H

bonds are, respectively,

MEDIUM

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?

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

Which statements about Boron and its compounds, among the following are true?
(i) Boron has high density and good electrical conductivity.
(ii)

{}^{10}B

isotope metal borides are useful as protective shields in nuclear industry.
(iii) Borax and boric acid are used in the manufacture of glasses.
(iv) Orthoboric acid is toxic and hence not useful in antiseptic solutions.

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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

HARD

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

Name the following element:

A trivalent metal used to make light tools.

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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

Name the following element:

An alkaline earth metal present in group $2$ and period $3$ .

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

An element belonging to Chalcogen group is

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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;

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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?

The group 16 elements are also known as pnictogens.

Important Questions on Elements of Groups 16, 17 and 18

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The group $16$ elements are also known as pnictogens.