Electrons are involved in two types of bonds that can exist in compounds. There is a property that can be used to predict the type of bond that will form during a reaction. This property is called electronegativity. it is the ability of an element to attract electrons when atom is in a compound.
What is the electrinegativity?
In general, electronegativity values decrease from top to bottom within a group. For representative elements, the values tend to increase from left to right across a period.
What is the trend of electronegativity?
Recall that atomic size tends increase from top to bottom, and nuclear charge increase, so atoms have less energy to attract electrons and they have less electronegativity.
Why it tends decrease from top to bottom within a group?
Recall that nuclear charge tends increase, atoms may have more energy to attract electrons, so that they have more electronegativity.
Why it tends increase from left to right across a period?
Wow!!! That's so coooool!!!
The noble gases are omitted because they are not form many compounds. They have the full electrons in the shells, so it's hard for them to lose or gain electrons.
Why there are few elements are not trend with that rule?