Question: Are bonded atoms "stuck" together?
About the article "Chemistry", section "Bonding".

Candidate passages:
Cyclopentadienyl is an organic compound with the chemical formula (CH) (also written ).
Cyclopentadienyl is closely related to cyclopentadiyne.
Cyclopentadienyl has five carbon atoms bonded together in a pentagonal planar ring, all five of which are bonded to individual hydrogen atoms.
Cyclopentadienyl is chemically aromatic and shows equal bond lengths between carbon atoms in the ring.
Cyclopentadienyl is known in organometallic chemistry where it forms cyclopentadienyl complexes. 
An intramolecular force is any force that holds together the atoms making up a molecule or compound.
They contain all types of chemical bond.
They are stronger than intermolecular forces, which are present between atoms or molecules that are not actually bonded. 
In organic chemistry, the phenyl group or phenyl ring is a cyclic group of atoms with the formula C6H5.
Phenyl groups are closely related to benzene.
Phenyl groups have six carbon atoms bonded together in a hexagonal planar ring, five of which are bonded to individual hydrogen atoms, with the remaining carbon bonded to a substituent.
Phenyl groups are commonplace in organic chemistry.
Although often depicted with alternating double and single bonds, phenyl groups are chemically aromatic and show nearly equal bond lengths between carbon atoms in the ring. 
The skeletal structure of an organic compound is the series of atoms bonded together that form the essential structure of the compound.
The skeleton can consist of chains, branches and/or rings of bonded atoms.
Skeletal atoms other than carbon or hydrogen are called "heteroatoms".
The skeleton has hydrogen and/or various substituents bonded to its atoms.
Hydrogen is the most common non-carbon atom that is bonded to carbon and, for simplicity, is not explicitly drawn.
In addition, carbon atoms are not generally labeled as such directly (i.e.
with a "C"), whereas heteroatoms are always explicitly noted as such (i.e.
using "N" for nitrogen, "O" for oxygen, etc.
)Heteroatoms and other groups of atoms that give rise to relatively high rates of chemical reactivity, or introduce specific and interesting characteristics in the spectra of compounds are called functional groups, as they give the molecule a function.
Heteroatoms and functional groups are known collectively as "substituents", as they are considered to be a substitute for the hydrogen atom that would be present in the parent hydrocarbon of the organic compound in question. 
Allotropy or allotropism () is the property of some chemical elements to exist in two or more different forms, known as allotropes of these elements.
Allotropes are different structural modifications of an element; the atoms of the element are bonded together in a different manner.
For example, the allotropes of carbon include diamond (where the carbon atoms are bonded together in a tetrahedral lattice arrangement), graphite (where the carbon atoms are bonded together in sheets of a hexagonal lattice), graphene (single sheets of graphite), and fullerenes (where the carbon atoms are bonded together in spherical, tubular, or ellipsoidal formations).
The term "allotropy" is used for elements only, not for compounds.
The more general term, used for any crystalline material, is polymorphism.
Allotropy refers only to different forms of an element within the same phase (i.e.
different solid, liquid or gas forms); these different states are not, themselves, considered to be examples of allotropy.
For some elements, allotropes have different molecular formulae which can persist in different phases – for example, two allotropes of oxygen (dioxygen, O2, and ozone, O3), can both exist in the solid, liquid and gaseous states.
Conversely, some elements do not maintain distinct allotropes in different phases – for example phosphorus has numerous solid allotropes, which all revert to the same P4 form when melted to the liquid state.