Three statements about potassium and chlorine and their ions are listed.3The atomic radius of a potassium atom is greater than the atomic radius of a chlorineatom.1The first ionisation energy of potassium is greater than the first ionisation energy ofchlorine.2The ionic radius of a potassium ion is greater than the ionic radius of a chloride ion.3Which statements are correct?
Question
Three statements about potassium and chlorine and their ions are listed.3The atomic radius of a potassium atom is greater than the atomic radius of a chlorineatom.1The first ionisation energy of potassium is greater than the first ionisation energy ofchlorine.2The ionic radius of a potassium ion is greater than the ionic radius of a chloride ion.3Which statements are correct?
Solution
Statement 1: The atomic radius of a potassium atom is greater than the atomic radius of a chlorine atom. This statement is correct. Potassium is located to the left of chlorine on the periodic table, which means it has fewer protons and a larger atomic radius.
Statement 2: The first ionisation energy of potassium is greater than the first ionisation energy of chlorine. This statement is incorrect. Ionisation energy increases across a period from left to right. Therefore, chlorine, which is to the right of potassium on the periodic table, has a higher first ionisation energy.
Statement 3: The ionic radius of a potassium ion is greater than the ionic radius of a chloride ion. This statement is incorrect. When potassium loses an electron to become a potassium ion, its radius decreases. On the other hand, when chlorine gains an electron to become a chloride ion, its radius increases. Therefore, a chloride ion has a larger radius than a potassium ion.
So, only statement 1 is correct.
Similar Questions
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