2. periods are
that run from left to right
3. elements in the same period have the same
every element in the first period has
element in the second period has
pattern?
shell for its
for its
every
see the
5. groups are
that run from top to bottom.
6. the elements of a group have the same number of
shell.
in their
7. every element in group one has
element in group two has
electron in its outer shell. every
electrons in its outer shell.
8. hydrogen is special because it can act like two groups,
and
9. hydrogen sometimes is
electron.
an electron and sometimes it has an
electrons in its outer shell, it is grouped
10. although helium has only
with elements that have
elements. they each
11. the green elements on this table are called
have two electrons in their outer shell.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

In physics the desire of an object to keep doing what it is doing is termed?

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?