Question

Is the following sentence true or false?

Mendeleev needed to organize information about 63 elements.
a) True
b) False

Answer 1

Mendeleev needed to organize information about 63 elements, which he did by developing the first periodic table based on atomic weights.

Step-by-step explanation:

The sentence is true. Mendeleev needed to organize information about 63 elements. He developed the first periodic table of elements in 1869 based on atomic weights. By arranging the elements in order of increasing atomic mass, he could observe patterns in the elements' chemical behavior that repeated at regular intervals.