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WorksheetsChemistry Unit 3 Test Review
Total questions: 15
Worksheet time: 8mins
Which statement about metals and nonmetals is correct?
Most metals are a solid under normal conditions, and most nonmetals are a liquid.
Metals can be hammered into thin sheets, and nonmetals are brittle.
Metals and nonmetals can both be found in any column of the periodic table.
Metals tend to be poor conductors of electricity, while nonmetals are strong conductors of electricity.
Use the periodic table (ptable.com) to answer the question:
Based on properties of elements in the periodic table, which element is the best conductor of thermal energy?
Germanium (Ge)
Polonium (Po)
Argon (Ar)
Vanadium (V)
Use the periodic table (ptable.com) to answer the question:
Which element has 4 valance electrons?
Silicon (Si)
Sulfur (S)
Beryllium (Br)
Potassium (K)
Which statement best explains why hydrogen’s atomic number is equal to its mass?
Hydrogen only has one electron
Hydrogen does not have any neutrons.
Hydrogen is stable, with two electrons in its outer shell.
Hydrogen is in the first row and the first column of the periodic table.
Use the periodic table (ptable.com) to answer the question:
Which statement correctly compares the valence electrons for atoms of francium (Fr) and barium (Ba)?
Barium has more valence electrons, and they are in a higher energy level.
Francium has more valence electrons, and they are in a higher energy level.
Francium has fewer valence electrons, but they are in a higher energy level.
Barium has fewer valence electrons, but they are in a higher energy level.
Gallium has an atomic number of 31 and a mass number of 70. Which shows the number of protons, neutrons, and electrons in a gallium ion with a +3 charge?
Protons: 31
Neutrons: 39
Electrons: 28
Protons: 39
Neurons: 31
Electrons: 26
Protons: 31
Neutrons: 39
Electrons: 31
Protons: 39
Neutrons: 31
Electrons: 39
Which is true about about stable isotopes?
Isotopes are always unstable because they are radioactive.
Isotopes that are naturally occurring in nature are always unstable.
A stable nucleus has a similar number of protons and neutrons.
Isotopes with more neutrons than protons are always stable.
On which atomic property proposed by Henry Moseley is the current periodic table of the elements based?
Atomic weight
Electric charge
Nucleus size
Atomic number
Which incorrect aspect of Rutherford’s model was fixed by Bohr’s model?
Positively charged nuclei repel positively charged alpha particles.
Atoms have small, dense, positively charged nuclei.
Electrons move freely in curved paths around the nucleus.
The nucleus contains most of the mass of an atom.
You plan to pass alpha particles through a field that contains a consistent type of particle. Which configuration will result in the largest deflection of alpha particles?
high-energy alpha particles passing through a field of high mass-number-particles
high-energy alpha particles passing through a field of low mass-number-particles
low-energy alpha particles passing through a field of low mass-number-particles
low-energy alpha particles passing through a field of high mass-number-particles
Where on the periodic table do you find elements that have full valence electron shells?
across the top of the periodic table
across the bottom of the periodic table
on the right side of the periodic table
on the left side of the periodic table
Which element would have a full outer shell of electrons if it gained three electrons?
lithium
nitrogen
boron
argon
Which group of elements has the most similar chemical properties?
fluorine, chlorine, and iodine
aluminum, silicon, and phosphorus
uranium, plutonium, and lead
carbon, nitrogen, and oxygen
Group 2 elements have two valence electrons. Which kind of bond will they most likely form, and why?
An ionic bond is likely because they are metals and will want to bond with nonmetals.
An ionic bond is likely because they will want to give away two valence electrons in order to become stable.
A covalent bond is likely because they want to share those two valence electrons in order to become stable.
A metallic bond is likely because they are metals and can bond with other metals.
An element has six valence electrons. Which ionic charge will its ion carry?
2+
6-
6+
2-
