The atomic number of nitrogen is 7 and that of oxygen is 8. The total number of electrons in a nitrate ion will be

Number of electrons in nitrogen = 7 and number of electron is oxygen = 8 we know that formula of nitrate ion is NO₃⁻

We also know that number of electron  = (1 × Number of electrons in nitrogen) + (3 × number of electrons in oxygen) + 1  = (1 × 7) + (3 × 8) + 1 = 32.