OSAS Science Grade 11 Practice Questions - Oregon Statewide Assessment System - Science, Grade 11 Exam

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A student records first ionization energies for three elements in the same period: Element X = 496 kJ/mol, Element Y = 738 kJ/mol, Element Z = 1520 kJ/mol. Which conclusion is best supported by this data?

Element Z is farthest to the left in the period Element X is a noble gas Element X loses an electron most easily of the three All three elements are in the same group

Correct Answer:

Element X loses an electron most easily of the three

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