Question

slide 15: practice: $_{35}^{82}br$
atomic number =

of protons =

of neutrons =

of electrons =

mass number = 82
name notation =

Explanation:

Step1: Recall atomic number definition

The atomic number is the sub - script in the notation $_{35}^{82}Br$. So, the atomic number is 35.

Step2: Recall proton - atomic number relation

The number of protons is equal to the atomic number. So, the number of protons is 35.

Step3: Calculate number of neutrons

The mass number is 82 (the superscript in $_{35}^{82}Br$). The number of neutrons is mass number minus atomic number. So, $82 - 35=47$.

Step4: Recall electron - proton relation for neutral atom

For a neutral atom, the number of electrons is equal to the number of protons. So, the number of electrons is 35.

Step5: Determine name notation

The name notation is bromine - 82.

Answer:

Atomic Number = 35

of Protons = 35

of Neutrons = 47

of Electrons = 35

Mass Number = 82
Name Notation = bromine - 82