Which atom in each pair is more electronegative? Li or K
Ca or Ni
O or S
Cl or Br
C or O
Ga or B

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)

Which polymers are most closely related? a. protein and nucleic acids b. cellulose and starch c. nucleic acids and starch d. nucleic acids and cellulose