Question

The atomic number of three elements A, B and C are 11, 14 and 17 respectively.
(i) State the group to which these elements belong in the modern periodic table.
(ii) Write the formula of the compound formed when the elements B reacts with C.

Answer 1

A: 2,8,1 ...Since valence electrons is 1,so it will b found in 1st grp

B:2,8,4... Since no. of valence electrons is 4,so (4+10=14) 14th grp

C:2,8,7...17th grp

Now valency of B is 4,n that of C is 1,so covalent bond will be formed with formula BC4...

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Answer 2

The element with the atomic nos. 11 , 14, 17 are respectively:

sodium

silicon

chlorine

Si + 2Cl2. SiCl. 4

Silicon react with chlorine to produce silicon chloride. This reaction takes place at a temperature of 340-420°C, in a flow argon.