multiple - choice question\nwhat do the blank boxes represent?\nelements mendeleev discovered\nelements that…

multiple - choice question\nwhat do the blank boxes represent?\nelements mendeleev discovered\nelements that are highly radioactive and could not be used safely at the time.\nelements mendeleev said would be discovered later.

multiple - choice question\nwhat do the blank boxes represent?\nelements mendeleev discovered\nelements that are highly radioactive and could not be used safely at the time.\nelements mendeleev said would be discovered later.

Answer

Brief Explanations:

Mendeleev left blank boxes in his periodic - table for elements he predicted would be discovered in the future based on the periodic trends he observed. He did not discover the elements in the blank boxes himself, and the reason for the blanks was not related to radioactivity.

Answer:

C. elements Mendeleev said would be discovered later.