Question

an element X belongs to 3rd period and group 16 of the modern periodic table (1)determine the number of Valence Electrons and the valency of X(2) molecular formula of the compound when x react hydrogen and write its electron dot structure(3) name the element X and state whether it is metallic or nonmetallic

Answer 1

1) Since the element belongs to group 16, therefore its electronic configuration is 2, 8, 6, and hence it has 6 valence electrons. Its valency is 8 – 6 = 2 (-2).

2) Molecular formula is XH2
..
Electron dot structure. ..X..

3) Element X is Sulphur. It is non metallic

Answer 2

The compound is Sulphur ( S)

• The compound that belongs to group 16 and the 3rd period in the periodic table is an element named "Sulphur" (S).
• Its atomic number is 16, and its electronic configuration is 2,8,6.
• (1) The number of valence electrons of sulphur is 6. Its valency is 8-6 = 2.
• (2) When sulphur reacts with hydrogen, a compound called hydrogen sulfide is formed, the reaction can be given as follows:

                                        8H₂ + S₈ → 8H₂S

• (3) Sulphur (S), the element belonging to group 16 and 3rd period, is a non-metallic compound.
• The electron dot structure of H₂S can be given as follows: