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.
The energy change that accompanies the addition of an electron to an isolated gaseous atom is
bond energy
electronegativity
electron affinity
ionization energy
Correct answer is C
No explanation has been provided for this answer.
Which of the following elements would produce coloured ions in aqueous solution?
Calcium
lron
Magnesium
Sodium
Correct answer is B
No explanation has been provided for this answer.
Rare gases are stable because they
contain equal number of protons and neutrons
contain more electrons than protons
are chemically active
have octet structure
Correct answer is D
No explanation has been provided for this answer.
An element with the electron configuration of 1s 22s 22p 6 would have a combining power of
0
2
6
8
Correct answer is A
No explanation has been provided for this answer.
Which of the following ions has the electron configuration 2,8,8?
Na+
Mg2+
F-
CI-
Correct answer is D
Chlorine(Cl) has configuration 2,8,7 but Chlorine ion (Cl-) has 18 electrons and configuration 2,8,8.