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 atom of an element X combines with aluminium (13AI)?
AIX 2
AI 2X
AI2X 2
AI 2X 3
Correct answer is D
No explanation has been provided for this answer.
Elements which belong to the same group in the Periodic Table are characterized by
difference of +1 in the oxidation numbers of successive members
presence of the same number of outermost electrons in the respective atoms
difference of 14 atomic mass units between successive members
presence of the same number of electron shells in the respective atoms
Correct answer is B
No explanation has been provided for this answer.
P
C
R
S
Correct answer is D
It is because the tendency to loss electrons increases with an increase in atomic size and atomic increase down the group
belongs to group VI in the Periodic Table
belongs to periodic Table
contains 3 unpaired electrons in the ground state
has atomic number 27
Correct answer is A
No explanation has been provided for this answer.
What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons?
32
22
20
10
Correct answer is B
No explanation has been provided for this answer.