As the first five elements in Group 14 are considered in order from top to bottom, there are changes in both the A

electronegativity values and number of first shell electrons

B

electronegativity values and atomic radii

C

number of valence shell electrons and number of first shell electrons

D

number of valence shell electrons and atomic radii

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

What happens to isotopes that are unstable?

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?