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.
Which of the following statements about thermoplastic material is correct? They
do not melt on heating
harden on heating
decompose on heating
soften and melt on heating
Correct answer is D
No explanation has been provided for this answer.