kileahmaCEmma
Answered

  1. How did Dmitri Mendeleev deal with elements that had not yet been discovered?
AHe left blanks for them in his periodic table, as he predicted they would be discovered.
BHe gave them names and properties and placed them in the table.
CHe created them in his laboratory and placed them in the table.
DHe ignored them, placing them in the table and shifting others when they were discovered. 2. Which of the following elements have properties similar to those of astatine (At)? A. F, Br, I B. Ar, S, P C. F, Ar, Ne D. Na, Mg, Al 3.What is true of the ionic size of the elements in a group as one moves from top to bottom in that group?
AIonic size stays the same within the group.
BIonic size does not vary in any predictable way within the group.
CIonic size decreases from top to bottom within the group.
DIonic size increases from top to bottom within the group.

Verified Answer :

antonsandiego

The most sensible answer for the first qurstion is definitely A.He left blanks for them in his periodic table, as he predicted they would be discovered.
He couldn't just just imagine index and go with a flow, he left space for it in order to dicrover it through reactions.
What about the next question, the answer is A. F, Br, I, its properties similar to those of astatine (At).
The last one :D. Ionic size increases from top to bottom within the group.