The document discusses atomic size and radius, which is defined as the distance between the nucleus and the outermost shell of an atom. It notes that atomic radii follow two trends - decreasing from left to right within periods and increasing from top to bottom within groups on the periodic table.

3. The distance b/w the
nucleus the outermost
shell of an atom is called
atomic size or radius.

4. Atomic Radii follows two
trends:
 PERIODS:
 GROUPS:

5. In periods the atomic
radius decreases from
left to right.
DECREASES

6. In groups atomic radius increases
from top to bottom.
decreases
i
n
c
r
e
a
s
e
s

8. EDITED
BY
CPT: JAWAD