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

Question 26:

• JAMB 1997

In the periodic table, what is the property that decreases along the periodic and increases down the group?

A. Atomic number
B. Electron affinity
C. Ionization potential
D. Atomic radius

Question 27:

• JAMB 1998

Which of the following electron configurations indicates an atom with the highest ionization energy?

A. 2,8,7
B. 2,8,8,1
C. 2,8,8,2
D. 2,8,8,7

Question 28:

• JAMB 1999

Given that electronegativity increases across a period and decreases down a group in the periodic table, in which of the following compounds will the molecules be held together by the strongest hydrogen bond?

A. HF_(g)
B. NH_3(g)
C. CH_4(g)
D. HCl_(g)

Question 29:

• JAMB 2000

Which of the following statement is correct about the periodic table?

A. Elements in the same period have the same number of valency electron
B. The valence electron of the elements in the same period increase progressively across the period
C. Elements in the same group have the same number of electron shells
D. The non-metallic properties of the elements tend to decrease across each period

Question 30:

• JAMB 2000

The electron configuration of \(_{22}X^{2+}\) ion is

A. 1s² 2s²2p⁶ 3s² 3p⁶ 4s² 3d²
B. 1s² 2s²2p⁶ 3s² 3p⁶ 4s² 3d¹
C. 1s² 2s²2p⁶ 3s² 3p⁶
D. 1s² 2s²2p⁶ 3s² 3p⁶ 4s²