Magnesium chloride also known as MgCl2 is composed of two elements: magnesium (Mg) and chlorine (Cl). Therefore the answer to the question is two elements: magnesium and chlorine.
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There are two elements, carbon and hydrogen.
There are 118 elements in the periodic table of elements, including both naturally occurring and synthetic elements.
There were 118 elements known as of 2008.
there are 51 natural elements we know of