When a radioactive magnesium (mg) atom decays by emitting a positron, what is the identity of the resulting atom? a. aluminum (al) b. magnesium (mg) c. neon (ne) d. sodium (na)

The answer is: D. Sodium (Na).

Beta decay is radioactive decay in which a beta ray and a neutrino are emitted from an atomic nucleus.

There are two types of beta decay: beta minus and beta plus.

In beta plus decay (atomic number Z is decreased by one), a proton is converted to a neutron and positron and an electron neutrino, so mass number does not change.

In this example, magnesium (atomic number 12) is converted to dosium (atomic number 11).

sodium (Na)

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