Question

Which of the following elements is a metalloid

Answer 1

A metalloid can be:
 - Boron (B)
 - Silicon (Si)
 - Germanium ( Ge)
 - Arsenic (As) 
 - Antimony ( Sb)
 - Tellurium (Te)
 - Polonium (Po)

Hope this helps :)

Answer 2

Answer : Silicon is the element of Metalliod.

Explanation :

Metals : These are the elements that can easily loose electrons and forms cations.

For example : All the alkali or alkaline earth metals that is group 1 and 2 are the metals.

Non-metals : These are the elements that can easily gain electrons and form an anion.

For example : All the p-block elements that is group 13 to 18 are the non-metals.

Metalloids : These are the elements that shows both the property of metals and non-metals.

For example : Boron, silicon, germanium, arsenic, antimony, tellurium, polonium and astatine are the metalloids.

As per question, silicon is the elements of metalloids.

While, rubidium and vanadium are metals and radon is a noble gas.

Hence, the silicon is the element of Metalliod.