Compared to potassium (K), sodium (Na) has which of the following differences?

Higher first-ionization energy than K

Both smaller radius and higher first-ionization energy

Neither; Na has larger radius than K

Calcium (Ca, atomic number 20) differs from magnesium (Mg, atomic number 12) primarily by which of the following?

Larger atomic radius and lower first-ionization energy

Smaller atomic radius and higher first-ionization energy

Same atomic radius but different electronegativity

Calcium is a nonmetal while magnesium is a metal

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Trivia · Knowledge

Period-3 Specific Quiz: Elements Sodium to Argon (11–18) with Ca and Sc comparisons

Twelve multiple-choice questions on period-3 elements (Na–Ar, Z=11–18): names, symbols, common oxidation states, and contrasts with potassium (K, 19) and calcium (Ca, 20).0 takes

by @triviagang_dataUpdated 2d ago

Preview · 12 questions

01Which element is atomic number 11?
02What is the chemical symbol for the period-3 element with atomic number 12?
03Which period-3 element commonly shows a +3 oxidation state in many of its compounds?
04Which period-3 element is a noble gas and is chemically inert under normal conditions?
05Which period-3 element typically forms a -1 anion (halide) in ionic compounds?
06Compared to potassium (K), sodium (Na) has which of the following differences?
07Which period-3 element is a metalloid that commonly forms covalent network structures and has symbol Si?
08Which period-3 element commonly shows oxidation states of +4 and -2 in different compounds (e.g., dioxide and hydride)?
09Which period-3 element is a solid nonmetal that exists in several allotropes and commonly shows oxidation states −3 to +5?
10Calcium (Ca, atomic number 20) differs from magnesium (Mg, atomic number 12) primarily by which of the following?
11Which period-3 element commonly forms a colorless, odourless diatomic gas at room temperature and is essential for disinfection and bleaching?
12Which period-3 element is most chemically inert and does not form stable compounds under normal conditions?