Arsenic and silicon are similar in that they both

Answer : Arsenic and silicon are similar in that they both are, Metalloids.

Explanation :

As we know that there are three types of elements in a periodic table which are, metals, non-metals and metalloids.

Metals : These are the elements which can easily loose electrons and forms cations. They require less amount of energy to loose electrons because  the electrons are loosely bound to the nucleus.

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

Non-metals : These are the elements which can easily gain electrons and form an anion. They require more amount of energy to loose electrons because the electrons are tightly bound to the nucleus.

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, Arsenic and silicon are similar in properties because both are the elements of metalloids.

Hence, the arsenic and silicon are similar in that they both are, Metalloids.

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The teacher is mostly talking about the distillation of a mixture