How does carbon (C) differ from silicon( Si)? A. Carbon (C) has 1 less electron energy shell than silicon (Si).
B. Carbon (C) has 1 more proton energy shell than silicon (Si).
C. Carbon (C) has 1 less electron than silicon (Si).
D. Carbon (C) has 8 more electron energy shells than silicon (Si).

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?