Answer:
Xe : core electrons = 46
Xe : valence electrons = 8
Ca : core electrons = 18
Ca : valence electrons =2
Br : core electrons = 28
Br : valence electrons = 7
Explanation:
- Xe atom has atomic number 54, as a group 8 element, it has a valence (outermost) electrons of 7 meaning the rest of 46 electrons are core (inner) electrons.
- Ca atom is in group 2 in the periodic table. Having 20 electrons, two electrons are on the valence shell while the rest 18 are cor electrons.
- bromine is a halogene (group 7) and hence 7 valence electrons. it has 35 electrons. it has 28 core electrons.
