Question

What was the importance of Mendeleev's periodic table to chemists?

It determined the mass of every known element.
It helped define an element.
It provided a pattern of repeating properties for the elements.
It helped scientists discover previously unknown elements.

Answer 1

Answer: It’s C. It provided a pattern of repeating properties for the elements.

Step-by-step explanation:

Answer 2

it provided a pattern of repeating properties for the elements :)