Answer: In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in his periodic table for them
Explanation:
The answer is B. Your Welcome. Comment if it is wrong.
Start with an intriguing question. Like if you’re trying to sell a lavender infused pillowcase or something you could ask “Are you having trouble falling or staying asleep?” Like that.
It means he does not write to solve problems, he writes about the problem itself.