Question: Which characteristic was not included in Dmitri Mendeleev’s periodic table?

Answer: distribution of elements determined by electron configuration

Question: What is the primary atomic characteristic that Mendeleev used to organize the periodic table?

Answer: atomic mass

Question: Mendeleev left several blank spaces in his original periodic table.

Answer: elements that had yet to be discovered

Question: According to the periodic law, what is the relationship between elements and periods?

Answer: Element properties repeat from period to period.

Question: Which set of elements has similar properties?

Use the periodic table.

Answer: strontium, magnesium, calcium, beryllium