How does the periodic table in predicting the formula of a stable ionic compound?

A. Bond polarity is directly related to electronegativity difference. The greater the difference in electronegativity the more polar the bond.
b. When two elements are next to one another in the periodic table they have similar electronegativities. Chlorine has a value of 3.0 while bromine has a value of 2.8. These two atoms in Br-Cl would have a nonpolar covalent bond.

A. volume stays constant. just took took the quiz

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.