Question

read about how the periodic table of elements was created and adapted by scientists and check your comprehension. what is the central idea of the passage? the periodic table of the elements does not include compounds because scientists weren’t aware of them. years of research by many different scientists has resulted in the periodic table of the elements we know today. a three - dimensional periodic table allows a person to better visualize the symmetry of the periodic law. the periodic table of the elements should be arranged differently to account for elements that haven’t been discovered yet.

Explanation:

The passage focuses on how the periodic table was created and adapted by scientists, indicating years of research by many scientists led to the current - day periodic table. Option 1 is about what the periodic table doesn't include, not its creation. Option 3 is about a 3 - D periodic table's feature, not the creation. Option 4 is about future arrangement, not the creation process.

Answer:

The periodic table of the elements we know today is the result of years of research by many different scientists. So the answer is: Years of research by many different scientists has resulted in the periodic table of the elements we know today.