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.
Two elements, X and Y are in the same group on the periodic table because they both have the same
number of electronic shells
number of valence electrons
atomic size
atomic number
Correct answer is B
The members of the same group always have the same number of electrons in the outer shell (i.e number of valence electrons).
The atomic radii of metals are usually
greater than their ionic radii
equal to their ionic radii
less than their ionic radii
less than those of non-metals in the same period
Correct answer is A
Metals give off electrons. This means that atomic radius is always greater than the ionic radius for metals.
Which of the following ions has an electron configuration different from the other?
17CI-
8O2-
12Mg2+
13AI3+
Correct answer is A
\(_{17}\)Cl\(^-\) = 18 electrons = 2, 8, 8
\(_{12}\)Mg\(^{2+}\), \(_{8}\)O\(^{2-}\) and \(_{13}\)Al\(^{3+}\) all have 10 electrons = 2, 8.
Which of the following electron configurations represents that of an atom in its ground state?
1s 22s12p1
1s22s22p63s13p1
1s22s12p3
1s22s22p63s0
Correct answer is D
The ground state of an electron, the energy level it normally occupies, is the state of lowest energy for that electron.
The number of orbitals in a p-sub level of an atom is
2
3
5
6
Correct answer is B
The p- orbital has 3 subshells; P\(_x\), P\(_y\) and P\(_z\) subshells.