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

Question 11:

• JAMB 1980

Chlorine, bromine and iodine resemble each other in that all?

A. Dissolve in alkalis
B. React violently with hydrogen without heating
C. Displace each other from solutions of their salts
D. Are gases
E. Are liquids

Question 12:

• JAMB 1981

Sodium and potassium belong to the same group of the Periodic Table. This is because?

A. Both are metals
B. Both are soft and lighter than water
C. Both form cations by losing electrons
D. Both have identical electronic configuration
E. Both react with water vigorously

Question 13:

• JAMB 1981

Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)

A. 1s² 2s²2p⁶ 3s²
B. 1s² 2s²2p⁶ 3s² 3p1s² 2s²2p⁶ 3s¹
C. 1s² 2s²2p⁶ 3s¹
D. 1s² 2s²2p⁶ 3s^°
E. 1s² 2s²2p⁶ 4s¹

Question 14:

• JAMB 1983

If an element has the electronic configuration 1s ² 2s² 2p³ 3s² 3p⁴, it is

A. A metal
B. An alkaline earth metal
C. An s-block element
D. A p-Block element
E. A transition element

Question 15:

• JAMB 1983

An element is electronegative if

A. It has a tendency to exist in the gaseous from
B. Its ions dissolve readily in water
C. It has a tendency to lose electrons
D. It has a tendency to gain electrons
E. It readily froms covalent bonds