How to Find the Number of Valence Electrons??????

Question

How do you find the valence number of electrons in elements on the periodic table?

Here are a few

Helium -
Chlorine-
Aluminum-
Boron-

Answer 1

What is Valence Electrons?
Valence electrons are the electrons contained in the outermost, or valence, electron shell of an atom.

How many Valence Electrons are there for each atom?
Group 1 (I) (alkali metals): 1 valence electron
Group 2 (II) (alkaline earth metals): 2 valence electrons
Group 13 (III) (boron group): 3 valence electrons
Group 14 (IV) (carbon group): 4 valence electrons
Group 15 (V) (nitrogen group): 5 valence electrons
Group 16 (VI) (chalcogens): 6 valence electrons
Group 17 (VII) (halogens): 7 valence electrons
Group 18 (VIII or 0) (noble gases): 8 valence electrons, except He, which has 2 valence electrons
Groups 3-12 (transition metals): varies

Now follow the list, you can tell the # of valence electrons for the elements you have listed.

Answer 2

Alkali Metals Valence Electrons

Answer 3

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RE:
How to Find the Number of Valence Electrons??????
How do you find the valence number of electrons in elements on the periodic table?

Here are a few

Helium -
Chlorine-
Aluminum-
Boron-

Answer 4

how many valence electrons do alkali metals hAVE