Question

warm up: its all about the atom
fill in the following chart for your element:
symbol: br
atomic number
atomic mass
mass number

of protons

of electrons

of neutrons

name:
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Explanation:

Step1: Recall Bromine's properties

Bromine (Br) has an atomic number of 35, atomic mass (average) ≈ 79.90 (or 80 for simplicity), mass number (most common isotope) ≈ 80. Protons = atomic number = 35. Electrons (neutral) = protons = 35. Neutrons = mass number - atomic number = 80 - 35 = 45.

Step2: Fill the chart

• Atomic Number: 35 (protons in nucleus, defines element)
• Atomic Mass: ~79.90 (or 80)
• Mass Number: 80 (for \( ^{80}\text{Br} \))
• # of Protons: 35 (same as atomic number)
• # of Electrons: 35 (neutral atom, electrons = protons)
• # of Neutrons: \( 80 - 35 = 45 \) (mass number - atomic number)

Answer:

Symbol	Br
Atomic Mass	~79.90 (or 80)
Mass Number	80 (for common isotope)
# of Protons	35
# of Electrons	35
# of Neutrons	45