Which element has:
$(a)$ two shells,both of which are completely filled with electrons?
$(b)$ the electronic configuration $2, 8, 2$?

Three elements $B, Si$ and $Ge$ are:

Which of the following is the outermost shell for elements of period $2$?

Three elements $B$,$Si$ and $Ge$ are

An element is placed in $2^{nd}$ Group and $3^{rd}$ Period of the Periodic Table,burns in the presence of oxygen to form a basic oxide.
$(a)$ Identify the element.
$(b)$ Write the electronic configuration.
$(c)$ Write the balanced chemical equation when it burns in the presence of air.

What is the position of metalloids in the periodic table?