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.
To which group and period respectively does an element with 15 electrons belong?
3 and 3
3 and 5
5 and 3
5 and 5
Correct answer is C
(P) Arsenic is the element with 15 electrons which is found in Group 5 and Period 3
The bond formed when ammonia reacts with hydrogen ion to form ammonium ion is
Covalent
Dative
Hydrogen bond
Ionic
Correct answer is B
No explanation has been provided for this answer.
The number of unpaired electrons in an atom of an element 8Q is _______?
2
4
6
8
Correct answer is A
No explanation has been provided for this answer.
The alkaline earth metals have similar chemical properties because________?
They are in the same period
Their salts are colourless
They have the same number of valence electrons
They are very reactive
Correct answer is C
No explanation has been provided for this answer.
Which of the following halogens is solid at room temperature?
Bromine
Chlorine
Flourine
Iodine
Correct answer is D
No explanation has been provided for this answer.