[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 ") and so on farther and farther from the nucleus.The shells correspond to the principal quantum numbers (n ... As a general rule a main group element (except hydrogen or helium) tends to react to form a s 2 p 6 electron configuration.This tendency is called the octet rule because each bonded atom has 8 valence electrons including shared electrons .Similarly a transition metal tends to react to form a d 10 s 2 p 6 electron configuration.This tendency is called the 18- electron rule because each bonded ... 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. Sat May 13 2006 · The number of valence electrons of an element can be determined by the periodic table group of the element (see valence electron ): For main group e...

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