Three of the steps in the radioactive decay chain for ²⁴⁴₉₄Pu are shown in the following diagram. Below the symbol of each isotope are their half-lives. Identify the next isotope in the chain if the next step in the decay chain is an alpha emission.

Is the following statement true or false? The symbol for a positron is β^–.

Determine the nucleus that will produce manganese-53 when it undergoes positron emission.