World application
Gas used to fill balloons because it is lighter than air.
What is Helium
When sodium joins with chlorine to make table salt, it forms this type of bond.
What is an ionic bond
This element is the first on the periodic table.
What is hydrogen
At room temperature, oxygen exists in this state.
What is gas
This scientist created the first widely accepted periodic table.
Who is Dmitri Mendeleev
This element is added to toothpaste to help prevent cavities
What is fluorine (fluoride)
When two oxygen atoms share electrons to form O₂, they form this type of bond.
What is a covalent bond
Lithium and sodium belong to this family of soft, reactive metals.
What are alkali metals
This element is a shiny metal that is solid at room temperature and is used in cans and foil.
What is aluminum
This scientist discovered oxygen.
Who is Joseph Priestley
This element is used to strengthen glass in phones and tablets.
What is boron
When magnesium reacts with chlorine, it forms this type of bond.
What is an ionic bond
This element, atomic number 8, is essential for breathing.
What is oxygen
Carbon in pencils is in this state at room temperature.
What is solid
This scientist discovered that atoms contain tiny negatively charged particles called electrons.
Who is J.J. Thomson
This metal is used in lightweight bike frames and camping gear.
What is magnesium
When carbon shares electrons with hydrogen in methane (CH₄), it forms this type of bond
What are covalent bonds
This element, atomic number 14, is a metalloid used in electronics.
What is silicon
Neon glows in signs because it is this state of matter.
What is gas
This scientist suggested that all matter is made of tiny particles called atoms.
Who is John Dalton
This element is used as rocket fuel because it burns easily and cleanly.
What is hydrogen
Water forms when hydrogen and oxygen share electrons. This shared‑electron bond is called what?
What is a covalent bond
This element, atomic number 25, is the heaviest element within the first 25
What is manganese
Carbon can exist as diamond or graphite. These different solid forms are called what?
What are allotropes
This scientist discovered that atoms have a small, dense center called the nucleus.
Who is Ernest Rutherford