The phrase "a relatively unstable" is correct and usable in written English.
It can be used to describe something that is not very stable in comparison to other things, often in scientific, technical, or analytical contexts.
Example: "The compound is known to be a relatively unstable substance, making it difficult to handle safely."
Alternatives: "somewhat unstable" or "fairly unstable".
Because of the relatively weak intermolecular attractions (van der Waals forces) between the separate P4 molecules, the solid melts easily at 44.1° C and boils at about 280° C. Formation of tetrahedra requires bond angles of 60° instead of the preferred 90° 109° angles, so that white phosphorus is a relatively unstable, or metastable, form.
One of these rings was made up of only four carbon atoms, a relatively unstable configuration.
Small-scale private enterprises are also in a relatively unstable environment of policy and law and are relatively more susceptible to changes in the power sector and policies.
Measured by GDP per head, Qatar is the richest nation on earth, but is small, has substantial oil reserves and happens to be situated in a relatively unstable part of the world.
It is more likely that HfTe2, a relatively unstable compound, would be formed as an intermediate step before oxidation into HfO2 during the crystal growth rather than pure Hf scavenging oxygen its environment.
In Lake Buhăiescu Mare, the early Holocene is characterised by moderate fire activity and coarser sediment particle size indicating a relatively unstable catchment affected by burning events which activated erosional processes.
One of the preparations was a cold-water extract containing a compound relatively unstable to heat, luciferase; the other was a hot-water extract containing a relatively heat-stable compound, luciferin.
The HipB protein is both transcribed and degraded at a faster rate than HipA because antitoxin proteins are relatively unstable, with a lifetime of a few minutes [ 21].
The HPT in BP3651 was variable within a single culture only in strains with alleles longer than C8, leading us to speculate that an HPT might become relatively unstable with the addition of a single base.
A slightly higher variability of institutional quality factors within a country-pair indicates relatively unstable and fluctuating strengths of institutions.
Alternatively, a loss of the relatively unstable analyte 2-OHE1 mighaveave occurred during derivatization in the GCMS procedure that did not include ascorbic acid for preservation.
