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:
- Lithium : 3 protons
- Selenium: 34 protons
- Nickel: 28 protons
- Radon: 86 protons
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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