2
2 valance electrons
There are 27 valance electrons.
Calcium has 20 protons and electrons and a variable number of neutrons, depending on the isotope.
Iodine has 7 valance electrons
They have different numbers of valance electrons
6 valence electrons
6 valence electrons
4 energy levels with 2, 8, 8, 2 electrons in the energy levels.
there are six
Two.
none
2