Problem: Fill in the missing information for the neutral isotopes in the table belowElement:SeMass number:7765Number of neutrons:3645Number of protons:Number of electrons:36

Atomic number (Z): (from the periodic table)"

• represents the identity of the element
• reveals the number of protons
• in a neutral element:

            # of protons = # of electrons

Mass number (A)

• reveals the number of protons and neutrons

            mass number = # of protons + # of neutrons

Column 1:

Element: Se (selenium)

atomic number = 34

# of electrons = 34

# of protons = 34

# of neutrons = mass number – # of protons

# of neutrons = 77 – 34

# of neutrons = 43

Column 2:

# of protons = mass number – # of neutrons

# of protons = 65 – 36