help with electron and valence numbers

Can someone tell me how to find the number of electrons in an element? For example, how ddo I find the number of electrons in the element calcium? And what would the valencee number be?

Btw, the atmoic number of calcium is 20, so what would ne the number of electrons and valence number

 

dude your in wrong post area and electrons are the same number of protons and valance electrons are the last few on the outermost energy level!

 

use this
1s
2s2p
3s3p3d
4s4p4d4f
5s5p5d5f
6s6p6d6f
7s7p7d7f
8s8p8d8f
etc....

 

and vouch for helping you ?.... maybe LOL?

 

Number of electrons is easy. An atom must be neutral (otherwise it's an ion), so it has the same number of protons as electrons. Thus calcium has 20 electrons (arrangement 2,8,8,2).

Calcium is an alkaline earth metal and so it's valency would be 2, unless you mean something else. I don't take chemistry.

 

dude its (2,2,6,2,6,2) not (2,8,8,2)

 

valence electrons are 2

 

lagbot arent you gonna post YOU ARE ON btw

 

Electrons per shell 2, 8, 8, 2

http://en.wikipedia.org/wiki/Calcium

:huh:

 

reported for spamming.
also its against the rules to get vouches for no-risky tasks.

 

Atomic number is the number of protons in an element. The number of electrons are the same as the number of protons. The valence electrons are the number of electrons on the highest principal energy level.

The number of electrons is 20, and the number of valance electrons is 2. If you understand the periodic table this gets very easy.

 

Oh ok, thanks SuF. I would vouch,
but I can't acc.

 

wow this is retarded lee easily.. look at your peridoic table look at oxygen i forget the atmoic number i believe its valence is 6 no table infront of me. zyou will see 2-6 6 is the valence the amount of electrons in the outer shell. IF you think this is hard wait tilll balancing equations come although it isnt bad but this is easy..