Question

35
br
bromine
79.904
atomic # = ____
atomic mass = ____

of protons = ____

of neutrons = ____

of electrons = ____

Explanation:

Step1: Determine Atomic Number

The atomic number (Atomic #) is the number at the top of the element box, which is 35 for Bromine. Also, the number of protons equals the atomic number, so # of Protons = 35. In a neutral atom, the number of electrons equals the number of protons, so # of Electrons = 35.

Step2: Determine Atomic Mass

The atomic mass is the number at the bottom of the element box, which is 79.904 for Bromine.

Step3: Calculate Number of Neutrons

The number of neutrons is calculated by subtracting the atomic number from the atomic mass (rounded to the nearest whole number). So, Neutrons = Atomic Mass (rounded) - Atomic Number. Rounding 79.904 gives 80. Then, 80 - 35 = 45.

Answer:

Atomic # = 35
Atomic Mass = 79.904

of Protons = 35

of Neutrons = 45 (since \( 80 - 35 = 45 \), after rounding atomic mass to 80)

of Electrons = 35