The History and Arrangement of the Periodic Table Answers

What is the correct chronological order of scientists contributing to the modern periodic table?

One of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. Which property fits this description?

Which element below must be stored in oil because of its reactivity?

Alkali metal:

Metalloid (semimetal):

Which element below has properties of both metals and nonmetals?

Which solution below most likely shows a vivid color?

Which elements likely conduct electricity well? Check all that apply.

Halogen:

Lanthanide:

Which element below is the most reactive?

Which two elements most likely have the most similar properties?

Which element below is least reactive? Which element below must be stored in oil because of its reactivity?