WorksheetsPeriodic Trends & Atomic Structure — 15-Question Review
Total questions: 15
Worksheet time: 23mins
Which pair is most likely metallic based on properties?
Brittle, dull, electrical insulator
Malleable, lustrous, conductor
Low melting point, poor conductor
Forms anions, high electronegativity
Alkaline earth metals (Group 2) tend to __ because they have __ valence electrons.
gain 2 e⁻; 6
lose 2 e⁻; 2
gain 1 e⁻; 1
lose 1 e⁻; 1
Arrange from smallest to largest atomic radius: Na, Mg, Al, Si, P.
P < Si < Al < Mg < Na
Na < Mg < Al < Si < P
Si < P < Al < Mg < Na
Mg < Al < Si < P < Na
A phosphorus atom has 15 protons and 10 core electrons. The effective nuclear charge (Z_eff) felt by a valence electron is:
5+
10+
15+
25+
Which list shows increasing first ionization energy?
I, Br, Cl, F
F, Cl, Br, I
Cl, F, I, Br
Br, I, Cl, F
Except for He, noble gases have how many valence electrons?
2
6
8
10
Which of the following is not a periodic trend?
Atomic radius
Electron affinity
Melting point of every element in a group
Ionization energy
An element has a low first IE, but a huge jump between the second and third IEs. It most likely forms ions with charge:
1+
2+
3+
1–
Which ion has the smallest radius?
F−
O2−
Na+
Mg2+
In Period 3, which element has the highest first ionization energy?
Na
Mg
Cl
Ar
Which statement about the (as-yet undiscovered) element with atomic number 119 is most likely true?
It will be a nonmetal in Period 7.
It will be an alkali metal that tends to form 1+ cations.
It will have a full valence shell.
It will have only two energy levels.
Predicted properties of oganesson (Og, Z=118).
Full valence shell
Very low reactivity
Small atomic radius
Forms 2+ cations readily
Elements in the same group generally...
share similar chemical properties
have the same number of valence electrons
Moving left → right across a period, which combination best explains the decrease in atomic radius?
Z_eff decreases; shielding increases
Z_eff increases; shielding roughly constant
Nuclear charge constant; shielding decreases
Both Z_eff and shielding decrease
Which element is most likely to form a 2+ cation in ionic compounds?
Cl
S
Ca
Al
