Each diagram below represents the nucleus of a different atom.

The letters D, E, and Q show nuclei from the same element.

One of the characteristics that make an element to be different from others is the number of protons. This means each element has a defined number of protons, and this cannot be changed without changing the identity of the element itself. Here are some examples:

In the image, the number of protons is identified with the letter "p". This means atoms D, E, and Q have all one proton, while atom R has two protons.

Based on this, the atoms that belong to the same element are D, E, and Q.

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