Why was Mendeleev’s work so important?
A.
He helped scientists find the mass of each element.
B.
He showed repeating patterns in the properties of the elements.
C.
He helped scientists know where to find new elements.
A.
He helped scientists find the mass of each element.
B.
He showed repeating patterns in the properties of the elements.
C.
He helped scientists know where to find new elements.