How many valence electrons does an atom have?

Answer 1

This all depends on the element's atomic number (number of protons). Since atoms have the same number of protons as they do electrons, the atomic number is essentially equal to the number of electrons as well. For example Aluminum atomic There are lists, but you can just tell anyway according to which group they are in. Eg, elements in the same column as Ca have 2 outer electrons (and a valency of +2), elements in the same column as Na have 1 outer electron (and a valency of +1). At the other end of the table, elements in the same column as Cl have 7 outer electrons, and a valency of -1 (8-7=1). work it out- you don't need a list.

the number of electrons is equal to the atomic number

Valence electrons are the electrons in the outer shell of the atom, just figure out which subshell is the outershell and then you will be able to work out the valence electrons.

s shell holds 2

p shell holds 6

d shell holds 10

f shell holds 14 See the Related Questions. Also, see the related links to download a .pdf version of a periodic table that lists the electron configuration for each element.

Answer 2

An atom has a specific number of valence electrons based on its position in the Periodic Table. Elements in the same group have the same number of valence electrons, ranging from 1 to 8. Valence electrons are the electrons in the outermost energy level of an atom and play a significant role in determining the chemical behavior of an element.

Answer 3

An atom can have anywhere from 1 to 8 valence electrons. The number of valence electrons. Elements in the first column of the periodic table have one electron, those in the second have two. Those in the large block ins the middle (the transition elements, the lanthanides, and the actinides are generally considered to have two valence electron , though they have a property called variable valence.

The trend of valence electrons continues in the block on the left side (the last six columns).

The first column in this block has six valence electrons, and so forth until the last column in which the elements have eight valance electrons, except for helium which has two.

Answer 4

Group one= one valence e-

Group two= two valence e-'s

Group three= three valence e-'s

Group four= four valence e-'s

Group five= five valence e-'s

Group six= six valence e-'s

Group seven= seven valence e-'s

Groups eight, nine, and ten= eight valence e-'s

Group eleven= one valence e-'s

Group twelve= two valence e-'s

Group thirteen= three valence e-'s

Group fourteen= four valence e-'s

Group fifteen= five valence e-'s

Group sixteen= six valence e-'s

Group seventeen= seven valence e-'s

Group eighteen= none valence e-'s

Answer 5

Valence electrons should not be confused with valency. The number of valence electrons is the number in the outer shell. It is not considered to be a useful concept for transition metals and the f block metals.

Ignoring the d block,transition metals; f block, lanthanides and actinides, we are left with the s block elements, groups 1 and 2 and p block elements, group 13-18

Group 1 1

Group 2 2

Group 13 3

Group 14 4

Group 15 5

Group 16 6

Group 17 7

Group 18 8, (exception Helium which has just 2)

Answer 6

Answer: one

Answer 7

Noble gases have the maximum possible number of valence electrons, which is 8.

Answer 8

The number of electrons will vary from element to element. Generally the number of electrons is equal to the number of protons which in turn is the same as the atomic number of the element.

Answer 9

the atomic number

Answer 10

2 then 6 then 8