A new element, X, is discovered and is found to have 3 isotopes: X-130, X-132, and X-134. 50% of all atoms of element X are X-130; 40% are X-132; and the remaining 10% are X-134. What is the atomic mass of this new element? (Enter the number only and keep 1 decimal, as in 000.0 )

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

Ive had this before. your answer would be d. hope this ya