It has 8. It just depends on the group, like group 1 has 1 valence electron, and so on, but it doesn't count for metals, so when you get to group 2, skip the metals and go to group 13 which has 13 valence electrons. There's a pattern.
There is no such thing as group 18. In the Periodic Table, there are only groups 1-8. If that was a typo and you meant group 8, there are 8 valence electrons.
8 in all of them except for helium, which only has two valence electrons. See attached link for more information on valence electrons.
they are the noble gases. (He, Ne, Ar, Kr, Xe, Rn) all of their energy levels are filled up, that is why the elements in this group rarely have compounds.
Group 18 is the noble gases, which have 8 valence electrons.
Atoms of elements in Groups 13-18 have 10 fewer valence electrons than their groups numbers.However , helium atoms have only 2 valence electrons.
Gold has 25 valence electrons
This is a chemical element. You can find the how many electron in a single atom by using a Periodic Table.
A neutral atom of silicon will have 4 valence electrons. The amount of valence electrons that a neutral atom will have can be found by the atoms group number in the periodic table.
The number of electrons are different from one to another, however all of them have seven electrons in the valence shell.
There are 7 valence electrons in elements of group-17. They are called halogens.
That depends on the element in question. Atoms can have anywhere from 1 to 8 valence electrons. For the main group elements, Groups 1,2,13-18, the number of valence electrons are the number in the one's place in their group number, as follows: Group 1 Elements: 1 valence electron Group 2 Elements: 2 valence electrons Group 13 Elements: 3 valence electrons Group 14 Elements: 4 valence electrons Group 15 Elements: 5 valence electrons Group 16 Elements: 6 valence electrons Group 17 Elements: 7 valence electrons Group 18 Elements: 8 valence electrons The transition metals, Groups 3 - 12, are more complicated because they are adding d electrons, some of which behave like valence electrons, and many transition metals can have different numbers of valence electrons. For example manganese can have anywhere from 2 to 7 valence electrons.
Elements in group 8 all have 8 valence electrons, this is why these elements are in group 8, they are called noble gases, some examples are Argon, Xenon,
Halogen family members, or elements in group 17, have 7 valence electrons.
A total of 7 valence electrons. If I remember correctly, the number of valence electrons of all group A elements are designated by their group number. Chlorine is in group VIIA, hence 7 valence electrons.
Boron is located in group 3A. It is group 13 in modern notation. This set of elements have three valence electrons.Boron is in the 13th group in the periodic table. Elements in this group has 3 electrons in the outermost energy level. That means they have 3 valence electrons.
The Group 6A elements are oxygen, sulfur, selenium, tellurium and polonium. The number of valence electrons in Group 6A is 6.
Group 16 (VIB or VIA) elements have six valence electrons.
Group 16 (VIB or VIA) elements have six valence electrons.
Barium is a group 2 element. All group 2 elements have 2 valence electrons. Thus, barium has 2 valence electrons.
How many valence electrons do transition elements have?
Calcium has 2 valence electrons, like all Group 2 elements.