Atomic Structure
This subatomic particle has a positive charge.
“What is a proton?”
These horizontal rows in the periodic table show the number of electron shells in an atom.
“What are periods?”
This type of bond occurs when electrons are shared between atoms.
“What is a covalent bond?”
This law states that matter cannot be created or destroyed in a chemical reaction.
“What is the law of conservation of mass?”
This gas makes up about 78% of Earth’s atmosphere.
“What is nitrogen?”
This particle has no charge and is found in the nucleus.
“What is a neutron?”
These vertical columns in the periodic table contain elements with similar chemical properties.
“What are groups?”
This type of bond occurs when electrons are transferred from one atom to another.
“What is an ionic bond?”
The chemical formula H₂O₂ is the formula for this compound.
“What is hydrogen peroxide?”
This element is added to drinking water to help prevent tooth decay.
“What is fluorine/fluoride?”
This particle has almost no mass and orbits the nucleus in energy levels.
“What is an electron?”
This property increases as you move left to right across a period (atoms hold onto electrons more strongly).
“What is electronegativity?”
This type of bonding holds metal atoms together in a ‘sea of electrons.’
“What is metallic bonding?”
This type of reaction occurs when a substance reacts with oxygen, releasing heat and light.
“What is combustion?”
This noble gas is used in balloons because it is lighter than air and non-flammable.
“What is helium?”
The atomic number of an element tells you this.
“What is the number of protons?”
Alkali metals become more reactive as you move down the group because this outermost property changes.
“What is the outer electron is further from the nucleus?”
Water molecules are polar, meaning one end is slightly negative and the other end is slightly this.
“What is positive?”
When hydrochloric acid reacts with sodium hydroxide, the products are these two substances.
“What are water and sodium chloride?”
The main metal in stainless steel is this element, which is combined with nickel and chromium.
“What is iron?”
Isotopes of an element have the same number of protons but a different number of these particles.
“What are neutrons?”
As you go down Group 17 (the halogens), the elements become less reactive because of this trend in atomic structure.
“What is the decreasing attraction between the nucleus and outer electrons?”
The octet rule states that atoms are stable when they have this many electrons in their outer shell.
“What is eight?”
Balance this equation: Al + O₂ → Al₂O₃.
“What is 4Al + 3O₂ → 2Al₂O₃?”
This radioactive element was used in luminous watch dials before being banned for safety reasons.
“What is radium?”