Activity 1.6

1Classify elements from atomic number 11 to 18 as metals and non-metals depending on the electrons present in the outermost shell.
Ans:
ElementAtomic NumberNumber of electrons
in the outermost shell
Metal/Non-metal
Sodium111Metal
Magnesium122Metal
Aluminium133Metal
Silicon144(Metalloid)
Phosphorus155Non-metal
Sulphur166Non-metal
Chlorine177Non-metal
Argon188-----

2Write the electronic configuration of Mg, K, Ar and F.
Ans:
ElementElectronic Configuration
Magnesium (Mg)2, 8, 2
Potassium (K)2, 8, 8, 1
Argon (Ar)2, 8, 8
Fluorine (F)2, 7