Complete the following table about atomic structure, given the atomic number and number of neutrons for each atom.

Here are the solutions to the questions:

1.a.i)
To complete the table, we use the relationships:

• Number of protons = Atomic number
• Mass number = Number of protons + Number of neutrons
• For a neutral atom, Number of electrons = Number of protons

Let's fill in the missing values:

• Atom Q: Protons = 6, Neutrons = 6, Electrons = 5, Mass = 12. (All given or consistent: $6+6=12$)
• Atom R: Protons = 6, Neutrons = 8, Electrons = 6, Mass = ?
  • Mass = Protons + Neutrons = $6 + 8 = 14$.
• Atom Y: Protons = 8,