Question

1. create a model of aluminium-13 isotope

statements to help guide you:

• the atomic number of aluminium is 13.
• aluminium has 13 protons.
• aluminium-13 has __ neutrons because 13 – the number of protons = __.
• this atom is neutral because it has __ protons and __ electrons, which are equal.

draw the electrons

Explanation:

Step1: Calculate neutron count

Neutrons = Mass number - Protons = $13 - 13 = 0$

Step2: Identify electron count (neutral atom)

Electrons = Protons = $13$

Step3: Assign electrons to energy levels

1st shell: $2$ electrons, 2nd shell: $8$ electrons, 3rd shell: $3$ electrons

Answer:

• The atomic number of Aluminum is $\boldsymbol{13}$.
• Aluminum has $\boldsymbol{13}$ protons.
• Aluminum -13 has $\boldsymbol{0}$ neutrons because $13 -$ the number of protons $\boldsymbol{13} = \boldsymbol{0}$.
• This atom is neutral because it has $\boldsymbol{13}$ protons and $\boldsymbol{13}$ electrons, which are equal.
• Electron placement (for the model):
• Innermost (1st) ring: 2 electrons
• Middle (2nd) ring: 8 electrons
• Outermost (3rd) ring: 3 electrons