Valence Electrons

[MaiaRodriguezChoi3E]

How do you know how may valence electrons an element or compound has?

[nolansheow3G]

Start by checking the element's location on the periodic table. Elements in Group 1 have one valence electron, those in group 2 have two valence electrons. Then skip to group 13, under Boron. Group 13 elements have 3 valence electrons, then group 14 has 4, group 15 has 5, and so on until you reach group 18, which has a full valence shell.

[Emily Ng_4C]

You base it off of the group the elements are in. For example, Group 1 would have 1 valence electron. However, the transition metals will vary in how many valence electrons they will have.

[Douglas Nguyen 2J]

A good reminder of how many valence electrons is to look at the group number, which is typically indicated above the top element of each column. Group 1 has 1 valence electron, 2 has 2 electrons, 13 has 3, 14 has 4, 15 has 5....18 has 8. Groups 3-12, which are the transition metals, behave differently and therefore, this rule of thumb isn't applicable.

[Hilda Sauceda 3C]

Group 2 has 2 valence electrons and group 13 has 3 valence electrons........ etc...