1. Define metals and non-metals in terms of electrons? 2. Write about the formation of any three compounds? 3. Write down the valency and symbols of the following :- # Sodium # Hydrogen # Potassium # Chlorine # Magnesium # Alluminium # Bromine # Nitrogen # Sulphide PLEASE I NEED ANSWER OF ALL THE QUESTIONS!!
Answers
The substances which have the tendency to donate electron or the substances which have electropositive character are metals whereas the nonmetals have tendency to accept electrons or they posses electronegative character.....
2]. Formation of three compounds can occur when Ionic bond is formed....i.e the bond which occurs between elecrtropositive and electronegative atom for eg:-Nacl
Compounds can also formed by covalent or electrovalent bond....
3].valency of hydrogen is 1 and symbol is H...sodium and potassium has a valency 1 and symbols are Na and k respectively...chlorine has a valency 7 and symbol is cl magnesium is divalent and is denoted by Mg bromine has a valency of 7 and is Br nitrogen has a valency of 5 and its symbol is N.....sulphur has a valency of 6 and is denoted by S
non metals are the elements which have tendency to gain electron
2) a) metal reacts with water to form metal hydroxide
b) metal reacts with acid to form salt
c) metal reacts with oxygen to form metal oxide
3)a) Na valency 1+
b) H valency 1
c) K valency 1+
d) Cl valency 1-
e) Mg valency 2+
f) Al valency 3
g) Br valency -1
h) N valency -3
S valency of sulphur is -2