Question

question 6 (4 points) use the following bohr model and your periodic table to fill in the blanks: element name: ____ atomic #: __ atomic mass (rounded): __ # of protons: __ # of neutrons: __ #of electrons: __ # of energy levels (shells): __ # of valence electrons: ____ blank 1: blank 2: blank 3: blank 4: blank 5: blank 6: blank 7: blank 8:

Explanation:

Step1: Analyze the Bohr model

The Bohr model shows 2 energy levels (shells) and 1 valence electron (since the outermost shell has 1 electron). Elements with 1 valence electron in the outermost shell (and 2 energy levels) are in group 1, period 2. So the element is Lithium? Wait, no, period 2 would have 2 energy levels. Wait, the inner shell (first energy level) can hold 2 electrons, the outer shell (second) has 1. So total electrons: 2 + 1 = 3. So atomic number is 3 (since atomic number = number of protons = number of electrons).

Step2: Determine element details

• Element name: Lithium (atomic number 3)
• Atomic #: 3 (atomic number is number of protons, and for neutral atom, electrons = protons)
• Atomic mass (rounded): Lithium's atomic mass is approximately 7 (since mass number = protons + neutrons; protons = 3, neutrons = 7 - 3 = 4)
• # of protons: 3 (atomic number = protons)
• # of neutrons: 7 - 3 = 4 (mass number - atomic number)
• # of electrons: 3 (neutral atom, electrons = protons)
• # of energy levels (shells): 2 (from the Bohr model, two circles/shells)
• # of valence electrons: 1 (outermost shell has 1 electron)

Wait, but maybe it's Hydrogen? No, Hydrogen has 1 energy level. Wait the Bohr model has two shells (inner and outer). So first shell (n=1) has 2 electrons (max for n=1 is 2), second shell (n=2) has 1 electron. So total electrons: 2 + 1 = 3. So atomic number 3, which is Lithium.

Let's confirm:

• Element name: Lithium
• Atomic #: 3
• Atomic mass (rounded): 7 (actual is ~6.94, rounded to 7)
• # of protons: 3
• # of neutrons: 7 - 3 = 4
• # of electrons: 3
• # of energy levels (shells): 2 (two concentric circles, so two energy levels)
• # of valence electrons: 1 (electrons in outermost shell, which is the second shell here with 1 electron)

Answer:

Blank 1 (Element name): Lithium
Blank 2 (Atomic #): 3
Blank 3 (Atomic mass (rounded)): 7
Blank 4 (# of protons): 3
Blank 5 (# of neutrons): 4
Blank 6 (# of electrons): 3
Blank 7 (# of energy levels (shells)): 2
Blank 8 (# of valence electrons): 1

(Note: If the Bohr model was intended to be Hydrogen, but Hydrogen has 1 energy level. The diagram shows two shells, so Lithium is correct with atomic number 3, two energy levels, 1 valence electron.)