HELP ME PLEASE URGENT: 1. What can be concluded about the properties of the elements that border this staircase on the Periodic Table of the Elements?
A. These elements are metals.
B. These elements are liquids.
C. These elements have properties of both solids and gases.
D. These elements have properties of both metals and nonmetals.

2.

A100 kmol/h stream that is 97 mole% carbon tetrachloride (ccl4) and 3% carbon disulfide (cs2) is to be recovered from the bottom of a distillation column. the feed to the column is 16 mole% cs2 and 84% ccl4, and 2% of the ccl4 entering the column is contained in the overhead stream leaving the top of the column. calculate the mass and mole fractions of ccl4 in the overhead stream, and determine the molar flow rates of ccl4 and cs2 in the overhead and feed streams. 12. mw_ccla- 153.82; mw_cs2-76.14.