Salicylic acid has a benzenic ring, one carboxylic functional group and one phenolic hydroxilic functional group.
Explanation:
Salicylic acid has the molecular formula C₇H₆O₃ and the chemical diagram is found in the attached picture.
On the benzenic ring it have two functional groups namely the carboxylic group (-COOH) and the phenolic hydroxilic group (-OH).
Salicylic acid is a precursor in synthesis of the aspirin (acetylsalicylic acid).
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Salicylic acid
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A small atomic radius
Explanation:
Elements like calcium located towards the top of a group have high attraction for their valence electrons because they have a small atomic radius.
The farther electrons are from the nucleus the lesser the attraction from the nucleus on them.
Atomic radius is taken as half of the internuclear distance between two covalently bonded atoms of non-metallic atoms or half the distance between two nuclei in the solid state between metals.
The smaller the atomic radius the greater the pull of the valence electrons in an atom.
Down the group, atomic radius increases due addition of new electronic shells.
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Answer:
From my side I think it is Photoreceptors cells :
A photoreceptor cell is a specialized type of neuroepithelial cell found in the retina that is capable of visual phototransduction. The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes. To be more specific, photoreceptor proteins in the cell absorb photons, triggering a change in the cell's membrane potential.
There are currently three known types of photoreceptor cells in mammalian eyes: rods, cones, and photosensitive retinal ganglion cells. The two classic photoreceptor cells are rods and cones, each contributing information used by the visual system to form a representation of the visual world, sight. The rods are narrower than the cones and distributed differently across the retina, but the chemical process in each that supports phototransduction is similar. A third class of mammalian photoreceptor cell was discovered during the 1990s: the photosensitive ganglion cells. These cells do not contribute to sight directly, but are thought to support circadian rhythms and pupillary reflex.
Explanation: