an atom with an atomic number of 50 and a mass number of 120 contains\n50 protons, 50 electrons, 20…

an atom with an atomic number of 50 and a mass number of 120 contains\n50 protons, 50 electrons, 20 neutrons\n50 protons, 50 electrons, 50 neutrons\n50 protons, 50 electrons, 70 neutrons\n120 protons, 50 electrons, 70 neutrons

an atom with an atomic number of 50 and a mass number of 120 contains\n50 protons, 50 electrons, 20 neutrons\n50 protons, 50 electrons, 50 neutrons\n50 protons, 50 electrons, 70 neutrons\n120 protons, 50 electrons, 70 neutrons

Answer

Explanation:

Step1: Recall atomic number concept

The atomic number ($Z$) is equal to the number of protons and the number of electrons in a neutral atom. Given atomic number $Z = 50$, so the number of protons $p=50$ and the number of electrons $e = 50$.

Step2: Calculate number of neutrons

The mass - number ($A$) is the sum of the number of protons and neutrons. The formula is $A=p + n$. Given $A = 120$ and $p=50$, we can solve for the number of neutrons $n$. Rearranging the formula gives $n=A - p$. Substituting the values, we have $n=120 - 50=70$.

Answer:

50 protons, 50 electrons, 70 neutrons