Examlex
Which of the following terms means that the structure is impenetrable to X-rays?
Hydrogen
The lightest and most abundant chemical element in the universe, consisting of just one proton and often one electron.
Neutrons
Subatomic particles found in the nucleus of an atom, with no electrical charge and a mass slightly greater than that of protons.
Protons
Positively charged subatomic particles found in the nuclei of atoms which determine the element's identity and properties.
Element
A pure chemical substance consisting of one type of atom, distinguished by its atomic number.
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