Atomic structure and bonding - Jamb Chemistry Past Questions and Answers

Question 146:

• JAMB 2010

A noble gas with a high power of fog penetration used in aerodrome beacons is

A. Krpton
B. Argon
C. Helium
D. Neon

Question 147:

• JAMB 2010

Carbon (II) oxide is considered dangerous if inhaled mainly because it

A. Can cause injury to the nervous system
B. Competes with oxygen in the blood
C. Competes with carbon (IV) oxide in the blood
D. Can cause lung cancer

Question 148:

• JAMB 2011

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

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

Question 149:

• JAMB 2011

The relative atomic mass of a naturally occurring lithium consisting of 90% \(^7 _3\)Li and \(^6 _3\)10% Li is

A. 6.9
B. 7.1
C. 6.2
D. 6.8

Question 150:

• JAMB 2011

An isotope has an atomic number of 15 and a mass number of 31. The number of protons it contain is

A. 16
B. 15
C. 46
D. 31