Question

help me out in solving.
questions are :
a. will the valency of these elements be same or different?
b. which element will have the highest atomic number? ​

Answer 1

We all know that the chemical formula for water is H2O. How many times have we wondered why it is written as “H2O” and not something else? What is the reason for this particular formula? The answer to the above question is “Valency”. Let us know more about Valency and how it helps in determining a 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.

The Valency of First 20 Elements

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 ..
It is one of only two elements named after a person who was alive at the time of naming, the other being seaborgium, and the only element whose namesake is alive today. Oganesson has the highest atomic number and highest atomic mass of all known elements.
Element category: Unknown chemical properties, was expected to be a noble gas; n...
Atomic number (Z): 118
Mass number: (unconfirmed: 295)
Period: period 7

Answer 2

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