Chemistry Practice Tests – Atomic Structure and Chemical Combination

The noble gases have been grouped in ________

(a) Group 4      (b) Group 3      (c) Group 1      (d) Group O

Which of the following metals has the strongest metallic bond? (WASSCE 2017)

(a) ₁₉K      (b) ₁₃Al      (c) ₁₂Mg      (d) ₁₁Na

NH₄ is formed from NH₃ and H by _______ (WASSCE)

(a) covalent bonding.     (b) dative bonding.     (c) hydrogen bonding.     (d) ionic bonding

The ions X and Y are isoelectronic, each containing a total of 10 electrons. How many protons are ¡n the nuclei of the neutral atoms of X and Y respectively? (JAMB 1991)

A. 10 and 10
B. 9 and 9
C. 11 and 9
D. 9 and 11

Atoms of element X (with 2 electrons in the outer shell) combine with atoms of Y (with 7 electrons in the outer shell). Which of the following statements is FALSE? The compound formed ______ (JAMB 1991)

A. has formula XY₂
B. is likely to be ionic
C. contains X²⁺ ions
D. contains Y^- ions.