Lanthanum with atom number 57 and mass number 139 has:
57 protons, 82 neutrons (since 57+82=139) and 57 electrons.
La-138 has 81 neutrons (i.s.o. 82) with 57 protons and 57 electrons.
nitrogen has 5 valence electrons. carbon has 4 valence electrons.
A barium atom has two valence electrons.
There are 3 valence electrons in an atom of aluminium.
A neutral atom of aluminum has 3 valence electrons.
Nitrogen has five valence electrons.
Lanthanum has 2 valence electrons.
nitrogen has 5 valence electrons. carbon has 4 valence electrons.
A barium atom has two 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.
There are 3 valence electrons in an atom of aluminium.
Nitrogen has five valence electrons.
A neutral atom of aluminum has 3 valence electrons.
A neutral atom of fluorine contains 7 valence electrons.
A chromium (Cr) atom has 6 valence electrons.
An atom of rhodium (Rh) has 9 valence electrons.
A fluorine atom has seven valence electrons, as do all halogens.
Two valence electrons