Write the abbreviated electron configuration for the following elements

i$)$ Arsenic

ii$)$ Barium

iii$)$ Samarium

Compare the electronegativities of $Mg$ and $Cl.$ Which may be higher? Why?

Draw the Lewis dot diagrams for the following:

a$)$ Oxygen atom

b$)$ Chlorine atom

c$)$ Magnesium atom

d$)$ Water molecule

e$)$ Ammonia $($NH$3)$