how to find valency of a atoms 1 to 20
Answers
Explanation:
Use the group numbers to determine the number of valence electrons. The Group number of a non-transition metal can be used to find the number of valence electrons in an atom of that element. The ones place of the group number is the number of valence electrons in an atom of these elements.
Answer:
What is Valency?
Valency is the measure of the combining capacity of atoms or molecules. Therefore, it is the capacity of an atom of a single element to react and combine with particular numbers of atoms of another element.
Explanation:
The Octet Rule
When an atom or molecule has from one to four electrons in its outer shell, it has a positive valency, meaning it donates its free electrons. When the number of electrons is four, five, six or seven, you determine the valency by subtracting the electron number from 8.
Element Symbol Atomic Number Valency
Hydrogen H 1 1
Helium He 2 0
Lithium Li 3 1
Beryllium Be 4 2
Boron B 5 3
Carbon C 6 4
Nitrogen N 7 3
Oxygen O 8 2
Fluorine F 9 1
Neon Ne 10 0
Sodium Na 11 1
Magnesium Mg 12 2
Aluminum Al 13 3
Silicon Si 14 4
Phosphorus P 15 3
Sulphur S 16 2
Chlorine Cl 17 1
Argon Ar 18 0
Potassium K 19 1
Calcium Ca 20