Chemistry Practice Tests – Atomic Structure and Chemical Combination

1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁷ 4s². An element with this electron configuration is a _____ (JAMB 1999)

A. non-metal
B. metal
C. transition element
D. group two element.

When element ₂₀Y combines with element ₈Z (WASSCE 2016)

 (a) a covalent compound, YZ is formed.
(b) a covalent compound, ZY is formed.
(c) an ionic compound, YZ is formed.
(d) an ionic compound, ZY is formed

If an element X of atomic number Z and mass number Y is irradiated by an intense concentration of neutrons, the relevant nuclear equation is _____ (JAMB 1998)

Water has a rather high boiling point despite its low molecular mass because of the presence of _____ (JAMB 1993)

A. hydrogen bonding
B. covalent bonding
C. ionic bonding
D. metallic bonding