nonmetal
Let an agent explain nonmetals, relay properties, periodic table position and classification debates from chemistry sources with differing schemes attributed, describe the named subgroups including metalloids, and distinguish nonmetals from metals, metalloids, noble gases as a subgroup and non-metallic materials.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain nonmetals, relay properties, periodic table position and classification debates from chemistry sources with differing schemes attributed, describe the named subgroups including metalloids, and distinguish nonmetals from metals, metalloids, noble gases as a subgroup and non-metallic materials.
A chemical element that generally lacks metallic properties, being a poor conductor of heat and electricity and tending to gain electrons, commonly including hydrogen, carbon, nitrogen, oxygen, phosphorus, sulfur, selenium, the halogens and the noble gases, and grouped by some sources as diatomic nonmetals such as hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine and iodine and polyatomic nonmetals such as carbon, phosphorus, sulfur and selenium; metalloids such as boron, silicon, arsenic and tellurium have intermediate properties and are classified variously, since IUPAC does not fix a single boundary.
What it is for: Not applicable; a class of elements.
It can be explain properties; relay periodic table position; describe named subgroups; relay classification debates.
Distinguishing features
Poor conductors
High electronegativity
Form covalent compounds
Boundary debated
What it looks like
Varied: colourless gases, black or yellow solids, and red-brown liquid bromine.
Physical character
commonly counted nonmetals: about 17-23 count - depends on scheme
location: upper right of the periodic table, plus hydrogen note
IUPAC position: no formal fixed definition of nonmetal boundary note
How it is recognised
Element lacking metallic character
Metalloid, polyatomic nonmetal, diatomic nonmetal, halogen, noble gas
Metals conduct and are malleable; metalloids are intermediate; noble gases are one nonmetal group; non-metallic materials are compounds
Related models
is a kind of - in registry terms
includes -
includes -
is contrasted with -
In practice
Families and kinds
reactive nonmetals
halogens
noble gases
diatomic and polyatomic nonmetals
metalloids as borderline
Standards and regulation
IUPAC periodic table recommendations
Failure modes and hazards
Presenting one classification as universal
Confusing metalloids with nonmetals
Hazards of reactive elements such as fluorine and white phosphorus
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.nonmetal
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What a nonmetal is.
Science.
Definition
Definition.
Definition
Definition.
- What is a nonmetal, and how does it differ from metals, metalloids, noble gases as a subgroup and non-metallic materials? definition
- Is the question about school chemistry, a specific element or classification? boundary
Subgroups
Named subgroups.
Subgroups
Subgroups.
- What are metalloids, diatomic nonmetals and polyatomic nonmetals? definition
- Which entry fits the specific subgroup? action
Chemistry Properties.
Science.
Properties
Properties.
Properties
Properties.
- What physical and chemical properties characterise nonmetals? provenance
- Which references are standard? provenance
Bonding
Bonding.
Bonding
Bonding.
- How do nonmetals form covalent and ionic bonds? provenance
- Which sources are cited? provenance
Classification Classification debates.
Attribution.
Boundary
Metal-nonmetal boundary.
Boundary
Boundary.
- Why do sources disagree on which elements are nonmetals or metalloids, with schemes attributed? provenance
- Which entry fits metalloid? action
Periodic table
Periodic table colours.
Periodic table
Periodic table.
- How do different periodic tables colour nonmetal categories? provenance
- Is the presentation neutral and attributed? boundary
Context Life and safety.
Context.
Life
Elements of life.
Life
Life.
- Why do nonmetals such as carbon, oxygen and nitrogen dominate living matter? provenance
- Which entry fits CHON? action
Hazards
Hazardous nonmetals.
Hazards
Hazards.
- Which nonmetals are especially hazardous, at reference level? provenance
- Which entry fits white phosphorus? action
What the second pass must settle
- Should metalloid be a separate primary entry?
- How should classification schemes be recorded?
- How should IUPAC sources be linked?