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.

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.

EASY

Earn 100

The element californium belongs to a family of

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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>Modern Periodic Law and the Present Form of the Periodic Table

The elements with atomic numbers

101

and

104

belong to, respectively:

HARD

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Modern Periodic Law and the Present Form of the Periodic Table

Name the following element:

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

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Modern Periodic Law and the Present Form of the Periodic Table

H_{3} {PO}_{2}

and

H_{3} {PO}_{3}

, the numbers of

P - H

bonds are, respectively,

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Modern Periodic Law and the Present Form of the Periodic Table

State modern periodic law.

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Modern Periodic Law and the Present Form of the Periodic Table

The indicator used during the estimation of

COD

of a water sample is

HARD

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Modern Periodic Law and the Present Form of the Periodic Table

Five elements

A, B, C, D

and

E

have atomic numbers of

2, 3, 7,10

and

18

respectively. The elements which belong to the same period of the periodic table are:

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Modern Periodic Law and the Present Form of the Periodic Table

Give a reason for the following:

Inert gases do not form ions.

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Modern Periodic Law and the Present Form of the Periodic Table

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

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Modern Periodic Law and the Present Form of the Periodic Table

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.

HARD

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Modern Periodic Law and the Present Form of the Periodic Table

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.