The external level of electrons in actinium has 2 electrons; but actinium is trivalent.
There are 2 valence electrons in Actinium.
Helium has 2 electrons (total of 2 electrons and 2 valence electrons)
The beryllium atom has 4 electrons and the valence is 2.
There are 2 valence electrons in an atom of magnesium. There are 5 valence electrons that are in an atom of phosphorus. There are 4 valence electrons that are in a silicon atom.
Helium is the only noble gas that doesn't have 8 valence electrons. It only has 2.
There are 2 valence electrons in Actinium.
Actinium has three valence electrons.
Helium has 2 electrons (total of 2 electrons and 2 valence electrons)
The beryllium atom has 4 electrons and the valence is 2.
Actinium has 2, 8, 18, 32, 18, 9, 2 electrons in each shell.
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).
There are 2 valence electrons in an atom of magnesium. There are 5 valence electrons that are in an atom of phosphorus. There are 4 valence electrons that are in a silicon atom.
2 valence electrons for calcium and 7 for chlorine.
Helium is the only noble gas that doesn't have 8 valence electrons. It only has 2.
There are 2 valence electrons in Radium. There are 2 valence electrons in Radium.
Calcium has 2 valence electrons, like all Group 2 elements.
Zinc has two valence electrons.