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: Count Protons (Atomic Number, \( Z \))

Protons are yellow \( + \) in the nucleus. Counting them: \( 9 \) (matches fluorine, \( \text{F} \), \( Z=9 \)).

Step2: Count Neutrons (Mass Number, \( A \))

Neutrons are blue circles in the nucleus. Protons (\( 9 \)) + Neutrons (\( 10 \)) = Mass Number (\( A = 19 \)).

Step3: Identify Nuclear Notation

Nuclear notation is \( _Z^A X \), where \( Z=9 \), \( A=19 \), and \( X=\text{F} \). This matches \( \boldsymbol{_{9}^{19}\text{F}} \).

Answer:

\( \boldsymbol{_{9}^{19}\text{F}} \) (the second option: \( \boldsymbol{_{9}^{19}\text{F}} \))