[Answer] An atom of element X has one more shell of electrons than an atom of beryllium but it has one less valence electron than beryllium. Which element is element X?

Answer: sodium (Na)

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An atom of element X has one more shell of electrons than an atom of beryllium but it has one less valence electron than beryllium. Which element is element X? Thu May 17 2001 · In chemistry and atomic physics an electron shell may be thought of as an orbit followed by electrons around an atom s nucleus.The closest shell to the nucleus is called the "1 shell " (also called the "K shell ") followed by the "2 shell " (or "L shell ") then the "3 shell " (or "M shell … Beryllium is a chemical element with the symbol Be and atomic number 4. It is a relatively rare element in the universe usually occurring as a product of the spallation of larger atomic nuclei that have collided with cosmic rays.Within the cores of stars beryllium is depleted as it is fused into heavier elements. It is a divalent element which occurs naturally only in combination with … Valence electron - Wikipedia Atom - Wikipedia Valence electron - Wikipedia Valence electron - Wikipedia where X is any atom or molecule X + is the ion with one electron removed and e − is the removed electron . This is generally an endothermic process. As a rule the closer the outermost electrons to the nucleus of the atom the higher the atom s ionization energy. The sciences of physics and chemistry use different units for ionization energy. An atom is the smallest unit of ordinary matter that forms a chemical element .Every solid liquid gas and plasma is composed of neutral or ionized atoms. Atoms are extremely small typically ...

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