Question

use the following bohr model and your periodic table to fill in the blanks:
image of bohr model with al
element name: aluminum
atomic #: ________
atomic mass (rounded): ________

of protons: ________

of neutrons: ________

#of electrons: ________

of energy levels (shells): ________

of valence electrons: ________

Explanation:

Step1: Recall Aluminum's atomic number

Aluminum (Al) has an atomic number of 13 (from periodic table).
Atomic #: $13$

Step2: Recall Aluminum's atomic mass

Atomic mass of Al is approximately 27 (rounded).
Atomic mass (rounded): $27$

Step3: Protons equal atomic number

of protons = atomic number = 13.

of protons: $13$

Step4: Neutrons = atomic mass - atomic number

Neutrons = 27 - 13 = 14.

of neutrons: $14$

Step5: Electrons equal protons (neutral atom)

of electrons = # of protons = 13.

of electrons: $13$

Step6: Count energy levels from Bohr model

The Bohr model shows 3 energy levels (shells) for Al.

of energy levels (shells): $3$

Step7: Valence electrons (outermost shell)

Aluminum's outermost shell (3rd) has 3 electrons.

of valence electrons: $3$

Answer:

Atomic #: $\boldsymbol{13}$
Atomic mass (rounded): $\boldsymbol{27}$

of protons: $\boldsymbol{13}$

of neutrons: $\boldsymbol{14}$

of electrons: $\boldsymbol{13}$

of energy levels (shells): $\boldsymbol{3}$

of valence electrons: $\boldsymbol{3}$