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. ⁹₄be ⁹₅b ⁵₉b ⁴₉be

Explanation:

Step1: Count protons

Count the number of protons in the nucleus. There are 4 protons, so the atomic number (sub - script in nuclear notation) is 4.

Step2: Count protons and neutrons

Count the total number of protons and neutrons in the nucleus. There are 4 protons and 5 neutrons, so the mass number (super - script in nuclear notation) is 4 + 5=9.

Answer:

$_{4}^{9}\text{Be}$