Question

Write a symbol for each of the following neutral isotopes, including the atomic number and mass number:

a) Carbon-12
b) Oxygen-18
c) Uranium-235
d) Hydrogen-1

Answer 1

To write symbols for isotopes, you use the notation A_ZX, with A being the mass number and Z the atomic number. Examples for Carbon-12, Oxygen-18, Uranium-235, and Hydrogen-1 are ^{12}_{6}C, ^{18}_{8}O, ^{235}_{92}U, and ^{1}_{1}H respectively.

Step-by-step explanation:

To write the symbols for each of the following neutral isotopes, including the atomic number (Z) and mass number (A), the notation is usually given as AZX where X is the chemical symbol of the element, A is the mass number, and Z is the atomic number.

• For carbon-12, the symbol would be ^{12}_{6}C with an atomic number of 6 and a mass number of 12.
• In the case of oxygen-18, the symbol is ^{18}_{8}O, with an atomic number of 8 and a mass number of 18.
• For uranium-235, the notation would be ^{235}_{92}U, where 92 is the atomic number, and 235 is the mass number.
• Last, for hydrogen-1, which is usually referred to as protium, the symbol is ^{1}_{1}H, with both the atomic number and mass number being 1.