When a covalent bond forms between two atoms, how many atoms have a full outer shell of electrons?
a) one
b) two
c) zero
d) it depends on what the atoms are.

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?

The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups?

The chart shows daniela’s run through her race. what is her velocity? 1.5 m/s 2 m/s 2.5 m/s 5 m/s