Answer
a. copper-64 : $^{64}_{29}Cu$
b. selenium-75: $^{75}_{34}Se$
c. sodium-24: $^{24}_{11}Na$
d. nitrogen-15 : $^{15}_{7}N$
Work Step by Step
1. Identify the symbol for each element:
a. Cu
b. Se
c. Na
d. N
2. Find its atomic number using a periodic table; it goes in the subscript on the left of the symbol.
a. 29 : $_{29}Cu$
b. 34: $_{34}Se$
c. 11: $_{11}Na$
d. 7 : $_{7}N$
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. 64 : $^{64}_{29}Cu$
b. 75: $^{75}_{34}Se$
c. 24: $^{24}_{11}Na$
d. 15 : $^{15}_{7}N$
