Question

question 5 (1 point)
an element with atomic number 6 undergoes $\beta$- decay. its atomic number is now
\bigcirc 7.
\bigcirc 6.
\bigcirc 5.
\bigcirc 2.

Explanation:

Step1: Recall β⁻ decay rule

In β⁻ decay, a neutron in the nucleus decays into a proton, an electron, and an antineutrino. The atomic number (Z) is the number of protons, so when a neutron becomes a proton, the number of protons increases by 1.

Step2: Calculate new atomic number

Initial atomic number \( Z = 6 \). After β⁻ decay, \( Z_{\text{new}} = Z + 1 = 6 + 1 = 7 \).

Answer:

7 (corresponding to the option "7.")