Question

when a positron is emitted from the nucleus of an atom, the nuclea decreases by one unit. increases by two units. increases by one unit. remains the same. decreases by two units. question 4 (1 point) saved the product from the alpha decay of $_{92}^{235}u$ is $_{80}^{233}ra$. $_{90}^{231}th$. $_{93}^{235}np$. $_{94}^{239}pu$. $_{92}^{236}u$.

Explanation:

Alpha decay involves the emission of an alpha particle (\(_{2}^{4}\text{He}\)). For the alpha decay of \(_{92}^{235}\text{U}\), the mass number decreases by 4 (\(235 - 4=231\)) and the atomic number decreases by 2 (\(92 - 2 = 90\)). The element with atomic number 90 is Thorium (Th).

Answer:

\(_{90}^{231}\text{Th}\)