What is the symbol of the element that is classified as a metalloid and is in Group IVA and period 3?

Silicon with symbol Si.

Explanation:

The metalloids; boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), polonium (Po) and astatine (At) are the elements found along the step like line between metals and non-metals of the periodic table.

They have 4 valence electrons in their outermost shell.

The one in period 3 is one with atomic number of 14 and electronic configuration of  2:8:4.

This element is Silicon with symbol Si.

It is a chemical element with the symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic lustre, and is a tetravalent metalloid and semiconductor. 

Silicon is one of man's most useful elements. In the form of sand and clay it is used to make concrete and brick; it is a useful refractory material for high-temperature work, and in the form of silicates it is used in making enamels, pottery, etc.

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the ratio of the conjugate base to the acid required to attain the desired ph.