Answer
a. $H$ Hydrogen
b. $Na$ Sodium
c. $K$ Potassium
d. $Pb$ Lead
e. $Br$ Bromine
f. $Pt$ Silver
g. $P$ Phosphorus
h. $He$ Helium
Work Step by Step
The atomic number is represented by the number above the elements in the periodic table.
You can find this answer at page 114 topic 4.4 'Atomic Number and Mass Number.'