Sentence examples for halogens from inspiring English sources
When aliphatic and aromatic hydrocarbons have hydrogen atoms in their structure replaced by halogens (often chlorine), they are known as halogenated hydrocarbons.
It is not attacked by air at room temperature but is oxidized at 600° 700° C (1,100° 1,300° F) and reacts quickly with the halogens to form tetrahalides.
The highly electronegative fluorine substituent stabilizes this intermediate much more than do the other halogens and causes it to be formed faster.
The simplest classification is into electron-attracting substituents (halogens, carbonyl, nitro, and positively charged groups) and electron-repelling groups (alkyl groups, negatively charged groups).
The elements of the long periods show a gradual increase in hardness and melting point from the beginning alkali metals to near the centre of the period and then at Group 16 (VIb) an irregular decrease to the halogens and noble gases.
Solid element 117 should be metallic in appearance, as is astatine, but it is expected that, instead of the −1 oxidation state characteristic of the natural halogens, it will show +1 and +3 oxidation states.
They then pass under a brilliant halogen light, where a digital camera takes a snapshot.
But new LEDs use just 12% and can produce light of similar quality to warm halogen bulbs.
The neighbour behind their house has installed a wind turbine and a massive halogen lamp outside his house and a helicopter landing-pad on top of it (a handy way to circumvent the ban), as well as a noisy calving barn right next to another neighbour's property.
A cluster of 13 atoms of aluminium, for example, was found to behave as though it is a single atom of the halogen group, which includes chlorine and iodine".Superatoms", as the researchers dub them, are a surprising and fascinating finding for chemists.
When illuminated by a halogen lamp, each type of material reflects a unique combination of wavelengths in the infra-red spectrum that can be identified, much like a fingerprint.
