Question

in the diagram, the same element is represented by the bohr model and the plum pudding model of the atom. what is the name of the isotope represented?
a boron-11
b boron-5
c sodium-11
d sodium-5

Explanation:

Step1: Determine the number of protons

From the Bohr model (diagram B), the number of protons (positive charges in the nucleus) is 5 (since the key shows + as protons, and we can count the protons in the nucleus). The number of protons determines the element, so an element with 5 protons is Boron (atomic number 5).

Step2: Determine the number of neutrons

From the diagrams, in the nucleus of the Bohr model, we can see the neutrons (the uncharged particles). Counting them, we have 6 neutrons. The mass number of an isotope is the sum of protons and neutrons, so \( 5 + 6 = 11 \).

Step3: Identify the isotope

Since the element with 5 protons is Boron, and the mass number is 11, the isotope is Boron - 11.

Answer:

A. Boron - 11