11 electrons will go in the first shell of chlorine.
11 electrons will go in the first shell of chlorine.
how many electrons will go in the first shell of chlorine?
11
each shell can contain only a fixed number of electrons: the first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. the general formula is that the "n"th shell can in principle hold up to 2("n") electrons. since electrons are electrically attracted to the nucleus, an atom's electrons will generally occupy outer shells only if the more inner shells have already been completely filled by other electrons. however, this is not a strict requirement: atoms may have two or even three incomplete outer shells. (see madelung rule for more details.) for an explanation of why electrons exist in these shells see electron configuration.
electron shell
core charge can also be calculated as 'atomic number' minus 'all electrons except those in the outer shell'. for example, chlorine (element 17), with electron configuration 1s 2s 2p 3s 3p, has 17 protons and 10 inner shell electrons (2 in the first shell, and 8 in the second) so:









































a core charge is the net charge of a nucleus, considering the completed shells of electrons to act as a 'shield.' as a core charge increases, the valence electrons are more strongly attracted to the nucleus, and the atomic radius decreases across the period.
core charge