Question

question 16 of 20 | total points: 14 out of 20 nucleus of an isotope of hydrogen. which of the following does not also represent an isotope of hydrogen?

Explanation:

Step1: Recall isotope definition

Isotopes have same protons, different neutrons.

Step2: Identify key for hydrogen

Hydrogen has 1 proton always.

Step3: Check options

Look for option with wrong proton count.

Answer:

Without seeing the specific content of the options clearly (assuming the pink represents a proton and green represents a neutron), isotopes of hydrogen have the same number of protons (1) but different numbers of neutrons. If an option has a different number of protons, it is not an isotope of hydrogen. If we assume the first option has an incorrect number of protons compared to the others, for example, if the first option has 2 protons and the others are consistent with hydrogen - like proton - neutron combinations, then the answer is the option with an incorrect number of protons. But since the visual options are not fully clear in text form, we need to know that isotopes of hydrogen (protium, deuterium, tritium) have 1 proton always and 0, 1, 2 neutrons respectively. If an option has 0 protons, it is not an isotope of hydrogen.