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

Question 1:

• JAMB 2019

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 2:

• JAMB 2019

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 3:

• JAMB 2019

In order to remove one electron from a 3S orbital of gaseous sodium atom, about 496KJMol^-1 of energy is required. This energy is referred to as

A. Electron affinity
B. Ionization energy
C. Activation evergy
D. Electronegativity

Question 4:

• JAMB 2019

1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁷, 4s²
An element with the electronic configuration above is a

A. Non-metal
B. Metal
C. Transition element
D. Group two element

Question 5:

• JAMB 2019

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)