Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
In which of the following series are the atoms arranged in order of increasing ionization energy?
Li, Na K
B, Be, Li
O, F, Ne
Be, mG, Ca
Correct answer is C
The ionization energy increases across the period. It increases up the group.
In the periodic table, alkaline earth metals can be found in group
l
ll
VI
VII
Correct answer is B
No explanation has been provided for this answer.
Rare gases are stable because they
are chemically active
contain equal number of protons and neutrons
contain more electrons than protons
have octet structures
Correct answer is D
They are the most stable due to having the maximum number of valence electrons their outer shell can hold. That means rare gases have the octet configuration.
Which of the following halogens is liquid at room temperature?
lodine
Chlorine
Bromine
Fluorine
Correct answer is C
Bromine is a reddish-brown liquid at room temperature.
In the periodic table all elements within the same group have the same
number of neutrons
number of valence electrons
number of isotopes
atomic number
Correct answer is B
The elements in the same group in the periodic table has the same number of electrons in the outer shell. That means, they have the same number of valence electrons.