Answer
a. indium-111 : $^{111}_{49}In$
b. palladium-103: $^{103}_{46}Pd$
c. barium-131: $^{131}_{56}Ba$
d. rubidium-82 : $^{82}_{37}Rb$
Work Step by Step
1. Identify the symbol for each element:
a. In
b. Pd
c. Ba
d. Rb
2. Find its atomic number using a periodic table, it goes in the subscript on the left of the symbol.
a. 49 : $_{49}In$
b. 46: $_{46}Pd$
c. 56: $_{56}Ba$
d. 37 : $_{37}Rb$
3. The number after the name of the element represents its atomic mass, and it goes in the superscript on the left of the symbol.
a. 111 : $^{111}_{49}In$
b. 103: $^{103}_{46}Pd$
c. 131: $^{131}_{56}Ba$
d. 82 : $^{82}_{37}Rb$
