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The periodic table key terms
Study The periodic table with curriculum-aligned Key Terms resources, practice links, and exam-focused support.
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key terms
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The periodic table
Key terms
Group 1 elements
Elements in Group 1 of the periodic table, including lithium, sodium, and potassium, known for their reactivity with chlorine and water.
halogen reaction
A chemical reaction involving halogens, such as chlorine, with metals or non-metals to form compounds.
alkali metals
Group 1 elements that react vigorously with water to produce hydrogen gas and a metal hydroxide.
reactivity
The tendency of an element to undergo a chemical reaction, which increases down Group 1 for alkali metals.
Group 1 elements
Elements in Group 1 of the periodic table, including lithium, sodium, and potassium, that have similar chemical properties due to having one electron in their outer shell.
similar chemical properties
The characteristic that Group 1 elements share, resulting from their identical outer electron configuration, leading to similar reactivity and bonding behavior.
Group 1 elements
Elements in Group 1 of the periodic table, including lithium, sodium, and potassium, known for their high reactivity.
reactivity trend
The observed increase in reactivity of Group 1 elements as you move down the group.
Group 1 elements
Elements in Group 1 of the periodic table, including lithium, sodium, and potassium, known for their similar chemical properties and reactivity.
reactivity trend
The pattern observed in Group 1 elements where reactivity increases as you move down the group.
halogens
Group 7 elements that are non-metals and exist as diatomic molecules.
Group 7
The group in the periodic table that contains the halogens, characterized by having seven electrons in their outer shell.
halogens
Elements in Group 7 of the periodic table that have seven electrons in their outer shell.
outer shell electrons
Electrons located in the highest energy level of an atom, which determine its chemical properties.
halogens
Group 7 elements that are non-metals and exist as diatomic molecules.
diatomic molecules
Molecules composed of two atoms, which in the case of halogens are pairs of the same element.
halogen
A non-metal element in Group 7 of the periodic table, known for forming salts with metals.
ionic compound
A compound formed when a metal reacts with a halogen, resulting in the transfer of electrons and formation of ions.
halogen
A non-metal element in Group 7 of the periodic table, known for forming diatomic molecules and having seven electrons in their outer shell.
non-metal compound
A chemical substance formed when halogens react with non-metals, typically resulting in covalent bonds.
relative molecular mass
The mass of a molecule relative to the mass of one twelfth of a carbon-12 atom.
Group 7
The group in the periodic table that contains the halogens, characterized by their diatomic molecular forms and trends in reactivity.
melting point
The temperature at which a solid becomes a liquid.
boiling point
The temperature at which a liquid becomes a gas.
Group 7
A group in the periodic table that contains the halogens, characterized by their reactivity and trends in properties.
reactivity
The tendency of an element to undergo chemical reactions, which decreases down Group 7 due to increasing atomic size and electron shielding.
halogen
A group of elements in Group 7 of the periodic table, known for their reactivity and ability to form salts with metals.
displacement reaction
A chemical reaction where one element replaces another in a compound, particularly observed between halogens and halide salts.
Group 7
A group in the periodic table consisting of halogens, known for their reactivity and trends in properties.
halogens
Elements in Group 7 of the periodic table, including fluorine, chlorine, bromine, iodine, and astatine, characterized by their diatomic molecular forms.
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