10 Interesting Facts About Atoms

10 Interesting Facts About Atoms Everything in the world consists of atoms, so its good to know something about them. Here are 10 interesting and useful atom facts. There are three parts to an atom. Protons have a positive electrical charge and are found together with neutrons (no electrical charge) in the nucleus of each atom. Negatively charged electrons orbit the nucleus.Atoms are the smallest particles that make up elements. Each element contains a different number of protons. For example, all hydrogen atoms have 1 proton while all carbon atoms have 6 protons.  Some matter consists of one type of atom (e.g., gold), while other matter is made of atoms bonded together to form compounds (e.g., sodium chloride).Atoms are mostly empty space. The nucleus of an atom is extremely dense and contains nearly all of the mass of each atom. Electrons contribute very little mass to the atom (it takes 1,836 electrons to equal the size of a proton)  and orbit so far away from the nucleus that each atom is 99.9% empty space. If the atom was the size of a sports arena, the nucleus would be the size of a pea. Although the nucleus is much denser compared wit h the rest of the atom, it too consists mainly of empty space.​ There are over 100 different kinds of atoms. About 92 of them occur naturally, while the remainder are made in labs. The first new atom made by man was technetium, which has 43 protons.  New atoms can be made by adding more protons to an atomic nucleus. However, these new atoms (elements) are unstable and decay into smaller atoms instantaneously. Usually, we only know a new atom was created by identifying the smaller atoms from this decay.The components of an atom are held together by three forces. Protons and neutrons are held together by the strong and weak nuclear forces. Electrical attraction holds electrons and protons. While electrical repulsion repels protons away from each other, the attracting nuclear force is much stronger than electrical repulsion. The strong force that binds together protons and neutrons is 1,038 times more powerful than gravity, but it acts over a very short range, so particles need to be very close to each other to feel its effect.The word atom comes from the Greek word for uncuttable or undivided. The name comes from the 5th century BCE Greek philosopher Democritus, who believed matter consisted of particles that could not be cut into smaller particles. For a long time, people believed atoms were the fundamental uncuttable unit of matter. While atoms are the building blocks of elements, that can be divided into still smaller particles. Also, nuclear fission and nuclear decay can break atoms into smaller atoms. Atoms are very small. The average atom is about one-tenth of a  billionth of a meter across. The largest atom (cesium) is approximately nine times bigger than the smallest atom (helium).Although atoms are the smallest unit of an element, they consist of even tinier particles called quarks and leptons. An electron is a lepton. Protons and neutrons consist of three quarks each.The most abundant type of atom in the universe is the hydrogen atom. Nearly 74% of the atoms in the Milky Way galaxy are hydrogen atoms.You have around 7 billion billion billion atoms in your body, yet you replace about 98% of them every year! Take an Atom Quiz

Special Feeding Adaptations of the Seahorse

Special Feeding Adaptations of the Seahorse The seahorse is one of 54 different species of fish in the marine genus Hippocampus- a word that comes from the Greek word for horse. Only a small handful of species are commonly seen in tropical and temperate waters of both the Pacific and Atlantic Oceans. They range in size from tiny, 1/2-inch fish to nearly 14 inches in length. Seahorses are one of the only fish that swim in an upright position  and are the slowest-swimming of all fishes. Seahorses are generally considered to be an evolved form of pipefish.   How Sea Horses Eat Because they swim so slowly, eating can be a challenge for the seahorse. Further complicating things is the fact that a seahorse has no stomach. It needs to eat almost constantly because food quickly passes straight through its digestive system. According to  The Seahorse Trust, an adult seahorse will eat 30 to 50 times per day, while baby  seahorses  eat 3,000 pieces of food per day. Seahorses do not have teeth; they suck in their food and swallow it whole. Thus their prey needs to be very small. Primarily, seahorses feed on plankton, small fish and small crustaceans, such as shrimp and copepods. To compensate for its lack of swimming speed, a seahorses neck is well adapted for catching prey, reports Scientific American. Seahorses ambush their prey by hovering silently nearby, attached to plants or corals and often camouflaged to blend in with their surroundings. Suddenly, the seahorse will tilt its head and slurp in its prey. This movement results in a distinctive sound. Unlike their relatives, the pipefish, seahorses can extend their heads forward, a process that is aided by their curving neck. Although they cant swim as well as pipefish, The seahorse has the ability to stealthily reach out and strike their prey. This means that they can wait for prey to pass by their perch, rather than actively pursuing them- a task that is difficult given their very slow speed. The hunt for prey is also aided by the seahorses eyes, which have evolved to move independently, allowing them an easier search for prey.   Seahorses as Aquarium Specimens What about captive seahorses? Seahorses are popular in the aquarium trade, and there is currently a movement to raise seahorses in captivity to protect the wild population. With coral reefs in danger, the native habitat of the seahorse is also challenged, leading to ethical concerns about harvesting them from the wild for the aquarium trade. Further, captive-bred seahorses seem to thrive better in aquariums than do capture  wild seahorses.   However, efforts to breed seahorses in captivity is somewhat complicated by the fact that young seahorses prefer live food that must be very small, given the tiny size of the young seahorses. While they are often fed frozen crustaceans, captive seahorses do better when feeding on live food. An article in the journal Aquaculture, suggests that live wild- or captive-raised copepods (tiny crustaceans)  and rotifers are a good food source that allows young seahorses to thrive in captivity.   References and Further Information: Bai, N. 2011. How the Seahorse Got Its Curves. Scientific American. Accessed August 29, 2013. Birch Aquarium. Secrets of the Seahorse. Accessed August 29, 2013. Project Seahorse. Why Seahorse? Essential Facts About Seahorses. Accessed August 29, 2013. Scales, H. 2009. Poseidons Steed: The Story of Seahorses, From Myth to Reality. Gotham Books. Souza-Santos, L.P. 2013. Prey Selection of Juvenile Seahorses. Aquaculture: 404-405:35-40. Accessed August 29, 2013.