The periodic table and periodicity of elements - Jamb Chemistry Past Questions and Answers

Question 6:

• JAMB 1978

The periodic classification of elements is an arrangement of the elements in order of their

A. Atomic Weights
B. Isotopic Weights
C. Molecular Weights
D. Atomic Numbers
E. Atomic Masses

Question 7:

• JAMB 1978

Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,

A. P will form an electrovalent bond with R
B. Q will form a covalent bond with S
C. R will form an electrovalent bond with S
D. Q will form an electrovalent bond with S
E. Q will form a covalent bond with R

Question 8:

• JAMB 1978

If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because

A. Both zinc and copper are metals
B. The sulphate radical and the zinc ion are divalent
C. Zinc is more electropositive than copper
D. Both zinc and copper form depositive ions in solution
E. Zinc is a reducing agent

Question 9:

• JAMB 1978

Five compounds R,T,W,X and Y form the following compounds: a basic hydride R.H, an acidic hydride YH, atmospheric oxide W₂O₃, XO₂. which of the elements is an alkali

A. R
B. T
C. W
D. X
E. Y

Question 10:

• JAMB 1979

Indicate which of the following statements is not true as we move from left to right along the periodic Table:

A. Atomic number of elements increases
B. Atomic mass of elements increases
C. Electropositive character of elements increases
D. Electronegative character of elements increases
E. Number of electrons in the outermost orbits of element increases