How to read Periodic Table for Valence e- [ENDORSED]

[Narhayne Nacana 3B]

Hi ya'll! Can anyone explain how to properly read the periodic table to find the valence electrons for the element? I was confused on how the professor found the valence electrons for Lewis Structures.

[Sunny Xiao 1A]

Hi! It's just the number of spots from the left. For example, looking at the 3rd row, Na has one valence electron, Mg has 2, Al has 3, Si has 4, etc..

[405479701]

The group number. When we go down a group, the number of valence electrons remains the same, although the number of shells increases.

[Ella_hou]

number of valence electrons is correlated to its group number on the periodic table. so for example, if you're trying to find the number of valence electrons in carbon, you can count up to it's group number which is 4 therefore you know there will be 4 valence electrons.

[Emily2J]

I just remember it by group number but you can connect it to our lectures from last week. As you move from the left to the right of the periodic table, electrons are added into the furthest orbitals with the weakest attraction to the nucleus. These are the valance electrons.

[Sanjana Narayanan 2J]

To add to these responses, for elements in the d block, only the s and p electrons are considered valence electrons.

[Reagan Feldman 1D]

The number of valence electrons corresponds to the atom's group number, which is the vertical columns on the periodic table. For example, Cl is in group 7, so it has 7 valence electrons.

[Jordyn Lee 1J]

How would you find the number of valence electrons for an element in the d-block?

[Allison Peng 1D]

Reply to Jordyn: atoms in the d-block usually only have 2 "valence" electrons due to the s-subshell electrons that are filled below the d block. since the d orbitals have lower energy than the s ones in that electron, only the s-subshell electrons are considered "valence". Again, this is the typical case, since any atoms with the possibility for d-block (n=3 or higher) have the possibility of "expanded valence," or more than 8 valence electrons that can be involved in bonding.

[Jahnavi Srinivas 2H]

To find the number of valence electrons in a given element, first identify the group that the element is in (signified by numbers above each column). This group number tells you how many valence electrons are in an element. For example, sodium (Na) is in group 1 so it has 1 valence electron.

[Alessandra Marotta 3L]

Hi! To identify the number of valence electrons using the periodic table, the number of valence electrons is equal to the atom's main group number. So as others have said, carbon is in group 4 and has 4 valence electrons and oxygen is in group 6 and has 6 valence electrons.

[005683006]

THe number of valance electrons corresponds with the number of the group.

[Jiayin Yola Yan 1G]

All groups have the same valence electron number (equal to the group number).

[Amanda Pineda 3H]

Basically for any element in a group, the last digit of that group number will be the amount of valence electrons for those elements in the group! This is why since oxygen is in group 16, they have 6 valence electrons. Hope this helps!

[Vivian Kim 3F]

To find the Valence electrons look at the columns from left to right starting with one. So for example, Chlorine is in group 7, so it has 7 valence electrons.

[Justin An 2L]

The number of valence electrons is essentially the ones digit of the group number!!

[105743571]

The number of valence e- is the same as the group the element is in. For example, Sodium and Lithium are in the first group for the periodic table hence have 1 valence electron. For groups 13 to 18, the number of valence electrons is their digit unit. For example, Fluorine and chlorine are in group 17, hence they have 7 valence electrons.

[SerenaSabedra]

The group number of an element indicates the valence electrons! All elements in group 5 will have 5 valence electrons, for example, regardless of period.

[Mahima Manoj 1F]

Generally, I would just look at the corresponding group number to figure it out. C is group 4 and has 4 valence electrons.

[Caitlyn Lo 2F]

Look at the group number to determine valence electrons.

[Madison Nguyen 3L]

Valence electrons for each element can be indicated by the elemental group number.

[Talia Tam 3L]

The number of valence electrons can be found by looking at the group number.

[Alex Luong 3H]

Some of the metals are in groups greater than 8, but you can just subtract 8 from that number and then you'll get the number of valence electrons.

[Alejandra Hernandez 2A]

To figure out the number of valance e- that an element has, you just need to look at its group number. For example, O is in group 6 so it has 6 valance electrons, CL is in group 7 so it has 7 valance e-, etc. Hope that helped :)