Answer:
37
Cl
17
(37 is a superscript to the left of the symbol, and 17 is a subscript to the left of the symbol)
Explanation:
1) Chlorine-37 is the chlorine isotope with mass number 37.
2) The atomic mass of chlorine is 17. All the atoms of chlorine have the same atomic number (all the atoms of an element have the same atomic number). You find this number in a periodic table.
3) The isotope representation consists of:
i) The symbol of the element (Cl in this case) at the center of the representation.
ii) The mass number (37) as a superscript to the left of the symbol. That is:
37
Cl
iii) The atomic number (17) as a subscript to the left of the symbol. That completes the representation in this form:
37
Cl
17
