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An unknown element is a non-metal and has a valence electronic configuration of ns²np⁴.
(a) How many valence electrons does this element have?
(b) What is the formula of the compound this element would form with potassium.
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Answer a Any element in group 1 has just one valence electron. Examples include hydrogen (H), lithium (Li), and sodium (Na). Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons). Examples include neon (Ne), argon (Ar), and krypton (Kr).
Answer b Potassium differs from sodium in a number of respects. Whereas sodium is essentially unreactive with graphite, potassium reacts to form a series of interlamellar compounds, the richest having the formula KC8. Compounds are formed with carbon–potassium atomic ratios of 8, 16, 24, 36, 48, and 60 to 1.
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