Chemistry Quiz

How does the atomic radius change across a period?

• It increases from left to right

• It decreases from left to right

• It stays the same across the period

• It increases from right to left

Which intermolecular force is present between water molecules?

• Ionic bonds

• Covalent bonds

• Hydrogen bonds

• Van der Waals forces

The electrons that are on the outer most shell of the atom called.

• Shell Electrons

• Valence Electrons

• Violent Electrons

• Random electrons

In which type of decay does the nucleus emit energy in the form of electromagnetic waves?

• Alpha decay

• Beta decay

• Gamma decay

• Neutron decay

Which of the given choices correctly shows the three main groups of elements listed from least conductivity to greatest conductivity?

• Metals, Nonmetals, Metalloids.

• Nonmetals, Metalloids, Metals.

• Metalloids, Metals, Nonmetals.

• Nonmetals, Metals, Metalloids.

A radioactive isotope has a half-life of 30 minutes. What fraction of the nuclei will have remained after 60 minutes?

• 1/2

• 1/4

• 1/8

• 1/16

Look at the image of the symbol of the Argon element from the periodic table. How many protons are in an Argon atom?

• 18 protons

• 40 protons

• 21.9 protons

• 22 protons

What does the "sea of electrons" allow in metallic bonding?

• High melting points.

• Free movement of electrons.

• Formation of ionic bonds.

• Polar covalent bonds.

What would be the general formula unit of a compound made with a Group 1 element, A, and a Group 16 element, Z, from the periodic table? Refer to the periodic table.

• AZ

• AZ₂

• AZ₁₆

• A₂Z

Which statement best explains why oil and water do not mix?

• Water molecules are polar, and oil molecules are nonpolar.

• Oil molecules are polar, and water molecules are nonpolar.

• Water molecules are carbon-based, and oil molecules are not.

• Oil and water both have covalent bonds and repel one another.