Question

determine the number of neutrons in one atom of magnesium. you must round the atomic weight to the nearest whole number. then, subtract protons to get neutrons. magnesium has _ neutrons. question 15 0.5 pts determine the number of neutrons in one atom of europium. you must round the atomic weight to the nearest whole number. then, subtract protons to get neutrons. europium has _ neutrons.

Explanation:

Step1: Get Mg's atomic data

Magnesium (Mg): Atomic number (protons) = 12, atomic weight ≈ 24.305

Step2: Round atomic weight

$\text{Rounded atomic weight} = \text{round}(24.305) = 24$

Step3: Calculate Mg's neutrons

$\text{Neutrons} = 24 - 12 = 12$

Step4: Get Eu's atomic data

Europium (Eu): Atomic number (protons) = 63, atomic weight ≈ 151.964

Step5: Round atomic weight

$\text{Rounded atomic weight} = \text{round}(151.964) = 152$

Step6: Calculate Eu's neutrons

$\text{Neutrons} = 152 - 63 = 89$

Answer:

Magnesium has 12 neutrons.
Europium has 89 neutrons.