Question

this is a bohr model of an atom or ion.
select the nuclear notation that represents this atom or ion.
refer to a periodic table.

Explanation:

Step1: Identify protons, neutrons, electrons

• Protons (yellow +): \( 1 \) (one proton).
• Neutrons (blue): \( 1 \) (one neutron).
• Electrons (light blue): \( 0 \) (no electrons shown).

Step2: Calculate mass number (\( A \)) and atomic number (\( Z \))

• Mass number \( A = \text{protons} + \text{neutrons} = 1 + 1 = 2 \).
• Atomic number \( Z = \text{protons} = 1 \) (element is Hydrogen, \( \text{H} \)).

Step3: Determine charge and nuclear notation

• Charge = protons - electrons = \( 1 - 0 = +1 \) (so \( \text{H}^+ \)).
• Nuclear notation: \( _Z^A \text{X}^{n+} = \boldsymbol{_1^2 \text{H}^+} \).

Step4: Match with options

• Option 3 (\( _1^2 \text{H}^+ \)) matches \( Z=1 \), \( A=2 \), element H, and charge \( +1 \).

Answer:

\( \boldsymbol{_1^2 \text{H}^+} \) (the third option: \( \boldsymbol{_1^2 \text{H}^+} \))