How does the periodic table indicate the number of valence electrons an element have?

Answer 1

By the group number of the A columns.....go apex :D

Answer 2

By looking at the column numbers

example:

Hydrogen

has 1 valence electron

Valency number is the same as the number "X" A on top of the group e.g Group1 1A has a valency of 1 group 2 2 A valency of 2 ........group5A valence of 5 in the Periodic Table there are metals nonmetals and metalloids

Answer 3

Well, the column containing hydrogen and lithium down has 1, the column with beryllium has 2, the column with boron has 3, the column with carbon has 4 , the column with nitrogen has 5, the column with oxygen has 6, the column with fluorine has 7 and the column with helium has 8. Transition metals generally have 2 with some exceptions.

Answer 4

Valence electrons are the electrons in the outermost energy level for any atom. For groups (Columns) 1 (Hydrogen's family), through 8 (Helium's family)it is fairly easy. In these the group number is the number of valence electrons. So if you were to look at Boron (element number 5) it is in group three so it has three valence electrons. If you looked at Silicon in group 4 it has 4 valence electrons. Once you get into what are called the transition metals (the columns with Sc through Zn at the top) it get's trickier. These metals can have unusual electron configurations which means their valence electrons can vary. As a general rule these will have 2 valence electrons (both in what is called the s sub-level) but again this can vary.

Answer 5

You can tell the amount of valence electrons by looking at the periodic table by looking at what group it is in. This is found out by looking at the box of the element and going straight up until you hit a number. This is the group number and also the number of valence electrons. The exception is for numbers 13, 14, 15, and so on. For these, just take the one off the number and that is the number of valence electrons. So, an element in group 15 would have 5 valence electrons. Another exception is He and H; they are different because each only have one shell and are full with two valence electrons. So an example of an element is Calcium - it is in group 2 and has 2 valence electrons.

Answer 6

The group number of an element indicates number of valence electrons.

Answer 7

Periodic table indicates the number of valence electrons.It show electron configuration of electrons.The last number of electron configuration represent number of valence electron.

Answer 8

by the group number of the A columns