Author: Study Clue

In NaCl formation, the step that is always strongly exothermic is the A Sodium ionization B Chlorine dissociation C Lattice

In NaCl formation, sodium’s ionization is favored mainly because sodium has A High electron affinity B High lattice constant C

Sodium forms Na⁺ easily because its valence shell becomes like A Helium configuration B Argon configuration C Krypton configuration D

Which statement best matches the meaning of “chemical bond” in molecules A Stable atom link B Nucleus attraction C Random

Which main reason best explains why atoms form chemical bonds A To increase mass B To gain stability C To

In the isoelectronic series O2−, F−, Na+, Mg2+, Al3+, the correct decreasing ionic radius order is A O2− > F−

A student notices that atomic radius of Ga is unexpectedly close to Al; the best reason is A d-block contraction

A student compares Ne and Ar in Group 18; the stronger dispersion forces in Ar mainly occur because A Higher

Mendeleev arranged elements primarily in order of increasing A Atomic number B Neutron number C Atomic mass D Atomic radius

Which statement best describes the modern periodic law A Properties depend on mass B Elements arranged by density C Properties