Question

how many neutrons does the element polonium have? polonium 84 po 209 hint: atomic mass - atomic number

Explanation:

Step1: Identify atomic mass and number

Atomic mass of polonium is 209, atomic number is 84.

Step2: Calculate number of neutrons

Use the formula: Neutrons = Atomic Mass - Atomic Number. So, $209 - 84=125$.

Answer:

125