how do you determine the number of valence electorns in an element?

Question

also, how many valence electrons does neon have?

Answer 1

neon has eight valence electrons..and how u determine the is u look at a periodic table and Looking at the periodic table at the top of the table to the far right, neon has eight valence electrons.(All of the elements below neon in the same column have eight valence electrons.)(Ne=neon)below explains how to determine how to find valence in elements.
The periodic table shows how elements can be grouped into families. Elements with atoms that have one valence electron are in Group I; elements with two valence electrons are in Group II; elements with six are in Group VI; and elements with seven are in Group. http://lgfl.skoool.co.uk/content.aspx?id=767
above is the periodic table link.....

Answer 2

Neon has 8 valence electrons because it is a Noble Gas and is on the eighth group on the periodic table. In order to find the valence electrons for any element, you can either write out it's electron configuration or you can look at a periodic table and count what column (group, family) the element is on. This does not work on the transition elements (the ones in the middle they are green in the chart at the link provided), for those you do have to do the electron configuration. But for the others just look at the number above the column (there's your answer) or for the ones on the right side of the chart (yellow, red, and pink colored on the chart at the link provided) you subtract ten from the number above the column.

http://periodic.lanl.gov/default.htm

1 Valence Electron:

H, Li, Na, K, Rb, Cs, Fr

2 Valence Electrons:

Be, Mg, Ca, Sr, Ba, Ra, He (the exception)

3 Valence Electrons:

B, Al, Ga, In, Ti

4 Valence Electrons:

C, Si, Ge, Sn, Pb

5 Valence Electrons:

N, P, As, Sb, Bi

6 Valence Electrons:

O, S, Se, Te, Po

7 Valence Electrons:

F,Cl, Br, I, At

8 Valence Electrons:

Ne, Ar, Kr, Xe, Rn

Answer 3

Ne has 8 valance electrons
You can find this from electron configurations
Ne is:
1s2,2s2,2p6
the highest energy level is 2 and the 2 energy level contains a total of 8 electrons. the highest energy level in an electron comfiguration is the valance elecrrons.

An easier way to find the valance electrons is to look at the periodic table. Group 1A has 1 valance elecron, Group 2A as 2 valance electrons, Group 3A has 3 valance electrons, and so on...

Answer 4

# of valence electrons equals number of electrons in last principle energy number (level), n

So If it is Neon, there are 8 valence electrons

[He]2s2,2p6 6+2=8

Answer 5

By looking at the Periodic Table of the Elements

Answer 6

you count them