Question

Elements
Valencies
+1
0
+1 .
+2
+3
+4
-3
-2.
-1
Hydrogen (H)
Helium (He)
Lithium (Li)
Beryllium (Be)
Boron (B)
Carbon (C)
Nitrogen (N)
Oxygen (0)
Fluorine (F)
Neon (Ne)
Sodium (Na)
Magnesium (Mg)
Aluminium (AI)
Silicon (Si)
Phosphorus (P)
Sulphur (S)
Chlorine (CI)
Argon (Ar)
Potassium (K)
Calcium (Ca)
0
+1
+2
+3
+4
-3
-2.
-1
0
+1 those who can tell me the trick of learning valency will be marked as the brainliest
+2​

Answer 1

Answer:

hello

pls mark as brainliest

Explanation:

just find out the rlectronic configuration

Na(11) = 2'8'1

hence valency of sodium is 1

Answer 2

Answer:

see all metals have a valency of 1,2 or 3 and have 1,2 or 3 electrons in their outermost shells whereas non metals have Valence electrons 5,6 or7 in their outermost shells and thus their valency is also 1,2,3 as they gain electrons in order to stabilise. Now, inert gases or noble gases have Valence electrons 0 and hence valency 0 as they have complete outermost shells and are stable. Metalloids have Valence electrons 4 i.e they are between metals and non metals and can gain or loose electrons to stabilize.

so the valency goes like this

1,2,3,4,3,2,1,0

and every 8th element has same no of Valence electrons till calcium and shows similar chemical properties

hope this helps

plz mark as brainliest