8th Grade Chemistry

Everyday Elements

100

What magnetic element is commonly found as an additive in breakfast cereal?

Iron

200

What element is the lightest element on the periodic table, and the most abundant in the universe?

Hydrogen

300

Diamonds, graphite, and coal are all different forms of what element?

Carbon

400

What halogen can be used to purify water?

Iodine

500

What element is responsible for the function of smoke detectors?

Americium

Periodic Table

100

The atomic number is defined as the number of what subatomic particle in an atom?

Proton

200

What group on the periodic table doesn't react with other elements?

Noble Gases

300

Each element in a row on the periodic table has the same number of what?

Orbitals / Orbits / Rings / Electron Shells

400

Holmium, used in medical lasers and nuclear reactors as an absorber, has what atomic number on the periodic table?

67

500

About 80% of the periodic table is made up of elements that fall in what category?

Metals

Atoms

100

The nucleus of an atom is made up of what two subatomic particles?

Protons and neutrons

200

A neutral atom has the same number of what two subatomic particles?

Protons and electrons

300

What is the overall charge of a nucleus?

Positive

400

The nucleus contains 99.9% of the mass of an atom, but what makes up 99.9% of the volume?

Empty Space / Void / Nothing

500

What's the average number of neutrons in gold? (Periodic table allowed)

118

Chemistry History

100

Democritus hypothesized that after cutting something down to a small enough size, you eventually reach a fundamental building block, which he called what?

Atomos / Atoms

200

Dmitri Mendeleev is credited for creating what modern organizational device for chemistry?

Periodic Table

300

Ernest Rutherford's experiment proved atoms have a nucleus by launching helium atoms at what element?

Gold

400

In 1966, what element was found in cow milk in Southern Utah due to nuclear weapon testing?

Strontium

500

Name one of the two elements intentionally left blank in Mendeleev's periodic table.

Gallium (eka-aluminum) / Germanium (eka-silicon)

Molecules

100

What's the common name for H₂O?

Water

200

True or false: Molecules are made up of two or more different elements

False (two or more atoms)

300

How many atoms are in a single molecule of glucose? C₆H₁₂O₆

24

400

A molecule of carbon dioxide forms what shape?

Line

500

After molecular hydrogen, what is the most common molecule in the universe?

Carbon monoxide/ CO