試題詳解

89. Alkali metals (Group 1) are different with alkaline earth metals (Group 2). Which of the following statements is correct?
(A) Alkali metals have larger ionic radii.
(B) Alkali metals have higher melting points.
(C) Alkali metals have greater first ionization energies.
(D) Alkali metals have greater densities.
(E) Alkali metals have greater electronegativity.