Valence Electrons

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305303255
Posts: 40
Joined: Thu Jul 25, 2019 12:16 am

Valence Electrons

Postby 305303255 » Sun Oct 27, 2019 10:21 pm

How do you find the number of valence electrons in an element?

Naneeta Desar 1K
Posts: 106
Joined: Fri Aug 09, 2019 12:15 am

Re: Valence Electrons

Postby Naneeta Desar 1K » Sun Oct 27, 2019 10:23 pm

You can figure out the amount by looking at the group the element is categorized under. The group number is usually the amount of valence electrons the element has.

Jessica Booth 2F
Posts: 101
Joined: Fri Aug 30, 2019 12:18 am

Re: Valence Electrons

Postby Jessica Booth 2F » Sun Oct 27, 2019 10:25 pm

You start from the left side of the periodic table and count across a period until you reach the element you're trying to find. The count is the number of valence electrons. If you're trying to find the number of valence electrons for a cation then you find the number of valence electrons and subtract the numerical value of the charge. If you're trying to find the number of valence electrons on an anion you add the numerical number of the charge to the valence electrons of the ground state element.

Sydney Pell 2E
Posts: 100
Joined: Wed Sep 11, 2019 12:17 am

Re: Valence Electrons

Postby Sydney Pell 2E » Sun Oct 27, 2019 10:26 pm

The number of valence electrons depends on where the element is in on the periodic table. For neutral atoms, it is the element's main group number (1-8). Group 1 elements have 1 valence e-, Group 2 had 2 valence e-, and so on. But, if the atom has a charge, then you would take the element's main group number and add or subtract valence electrons depending on if the ion is positively or negatively charged.


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