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.
86 and 230
87 and 234
88 and 233
90 and 238
Correct answer is A
\(^{234} _{88} Q \to R + ^4 _2 He\)
\(\therefore R = ^{234 - 4} _{88 - 2} R\)
= \(^{230} _{86} R\)
What is the atomic number of an element whose cation Y+ has the electronic configuration 1s22s22p6?
9
10
11
12
Correct answer is C
No explanation has been provided for this answer.
The valence electrons in a chloride ion are [17CI]
2p electrons only
3s and 3p electrons only
3p and 3d electrons only
3p electrons only
Correct answer is B
No explanation has been provided for this answer.
Find the number of neutrons in an atom represented by 4521X.
21
24
45
66
Correct answer is B
No explanation has been provided for this answer.
The mass spectrometer can be used to measure mass of
an atom
an electron
a proton
a neutron
Correct answer is A
No explanation has been provided for this answer.