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The entire Group 2A has 2 valence electrons; this includes sodium and calcium.

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13y ago

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How can the number of valence electrons be determined from the periodic table?

By looking at the group number you can tell how many valance electrons there are ex: Group 1= 1 valance electrons Group 2-12= 2 valance electrons Group 13= 3 valance electrons Group 14= 4 valance electrons Group 15= 5 valance electrons Group 16= 6 valance electrons Group 17= 7 valance electrons Group 18= 8 valance electrons


How many valance electrons does samarium have?

2 valance electrons


How many elements within a row different?

They have different numbers of valance electrons


What elements have two valance electrons?

alkaline earth metals


How many valance electrons do most elements need to have a stable electron configuration?

8 valance electron


How many Valance electrons in oxygen?

6 Use the periodic table as a guide. As you go across from left to right the number of valence electrons increases. H = 1 Be = 2 B = 3 C = 4 N = 5 O = 6 F = 7 This trend stays the same all the way down each column. Usually periodic tables are marked on the top with roman numerals or something to signify how many valence electrons each element has.


What has 5 electrons in its outer shell?

If you are talking about the valance electrons any elements in group 5 on the periodic table will have 5 valance electrons.


The elements within the periodic table are organized by?

1) atomic number (number of protons) 2) valance electrons


Valence electrons in magnesium?

2 valance electrons


How many valance electrons does halogen have?

Halogens are group 17 elements. They have 7 valence electrons.


How are elements within row different?

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What is the number of valence electrons for group 2 elements?

Group 2 metals have 2 valence electrons. In fact, the number of valence electrons of elements can be deduced from the group number (e.g. group VII elements have 7 valence electrons).