Write the valencies of some common elements and groups (i) Hydrogen (ii) Oxygen (iii) Aluminium (iv) Carbon (v) Nitrogen (Vi) Sulphur (vii) Iron (viii) Phosphate (ix) Chlorine (x) Iodine
Answers
hydrogen-1
oxygen-2
aluminum-3
carbon-4
nitrogen-3
sulphur-2
iron- 2;
phosphate-2
chlorine-1
iodine-1
Answer:
A characteristic of an element called "valency" describes how many additional atoms may interact covalently with one of its constituents.
Explanation:
The valencies of some common elements and groups are as follows below:
(i) Hydrogen - H: +1
(ii) Oxygen - O: -2
(iii) Aluminium - Al: +3
(iv) Carbon - C: +4
(v) Nitrogen - N: +3
(Vi) Sulphur - S: -2
(vii) Iron - Fe: +2, +3
(viii) Phosphate - PO₄²⁻: +3
(ix) Chlorine - Cl: -1
(x) Iodine - I: -1
Valence electrons are electrons in the atom's outermost orbit.
According to the Bohr-bury system, the outermost shell may hold up to 8 electrons.
When the outermost shell is fully filled, very little chemical activity is seen. We can also state that its capability for combining decreases to zero.
Hence, the valencies of each element and group are as mentioned above.
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