Question

what would be the electronic configuration of inner class A Lcube +, o square minus, cl minus

Answer 1

Answer:

1s2 2s2 2p6 3s2 3p6

Explanation:

Based on the periodic table, the atomic number (Z of chlorine is 17. Since the atomic number is always equal to the number of protons or
Z = number of protons
and in ground state (no charge), the number of protons is equal to the number of electrons, then
Z = number of protons = number of electrons (ground state)
Therefore, the ground state electron configuration of the element,
chlorine is: 1s2 2s2 2p6 3s2 3p5 = 17 electrons (just add the superscripts)

For a ground state element to become an ion, it has to either gain or lose an electron in its outermost orbital. Elements usually do this in order to gain the electron stability of the noble gases (octet rule).

Now, for you to be not confuse, you always have to remember that:
(1) electron gain will result to a negative charge (−), and
(2) electron loss will result to a positive charge (+),
The chloride ion, Cl−, has a charge of −1, meaning, it had gained 1 electron in its outermost orbital. The overall number of electrons is now 18.
Thus, the electron configuration for Cl− should be
1s2 2s2 2p6 3s2 3p6 = 18 electrons