Answer:
The boron has three valence electrons.
Explanation:
How to determine the valence électrons of Borom atom.
There are four simple steps to find out the valence electrons for borom atom wich are :
Step 1 : Find the Atomic Number
To find the atomic number of boron, we can use the periodic table. With the help of periodic table, we can easily see that the atomic number of boron is 5. As its atomic number is 5, it has five protons, and for neutral boron, the number of protons are always equal to the number of electrons i.e. has five electrons in its nucleus.
Step 2 : Write Electron
Electron configuration is the arrangement of electrons on the orbitals.
The électrons will be places in different orbitale according to thé energy level : [1s, 2s, 2p, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f].
Now, Boron,Electron configuration B(5) = 1s^22s^22p^1 (complete configuration).
=[He] 2s^2 2p^1 (condensed configuration).
Step 3 : Determine Valence Shell
As we know, the valence shell of an atom can be found from thé highest number of principle quantum numbers which are expressed in thé term of n, and in [He] 2s^2 2p^1
Step 4 : Fond Valence Electrons
The total number of electroons présent in valence shell of an atom are called valence electrons, and there are three électrons présent in thé valence shell of boron (2s^2 2p^1).
boron will be has a total of five electrons so, we have to put 5 electrons in o
Thus, the boron has three valence electrons.
<em>Note :</em> Be careful, however, not to forget the difference between Valencia Electrons and Valency.
Difference Between Valence Electrons and Valency
Valence electrons are the total number of electrons present in the outermost shell of an atom(i.e. in outermost or ital). The valence electrons for a neutral atom is always definite, it cannot be varied(more or less) in any condition for a particular atom and may or may not be equal to its valency.
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