Edufount

Atomic Number: 3 Atomic Weight: 6.941 Melting Point: 453.65 K (180.50°C or 356.90°F) Boiling Point: 1615 K (1342°C or 2448°F) Density: 0.534 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 2     Group Number: 1     Group Name: Alkali Metal What's in a name? From the Greek word for stone, lithos . Say what? Lithium is pronounced as LITH-ee-em . History and Uses: Lithium was discovered in the mineral petalite (LiAl(Si 2 O 5 ) 2 ) by Johann August Arfvedson in 1817. It was first isolated by William Thomas Brande and Sir Humphrey Davy through the electrolysis of lithium oxide (Li 2 O). Today, larger amounts of the metal are obtained through the electrolysis of lithium chloride (LiCl). Lithium is not found free in nature and makes up only 0.0007% of the earth's crust. Many uses have been found for lithium and its compounds. Lithium has the highest specific heat of any solid element

2 He Helium 4.002602 Atomic Number: 2 Atomic Weight: 4.002602 Melting Point: 0.95 K (-272.2°C or -458.0°F) Boiling Point: 4.22 K (-268.93°C or -452.07°F) Density: 0.0001785 grams per cubic centimeter Phase at Room Temperature: Gas Element Classification: Non-metal Period Number: 1     Group Number: 18     Group Name: Noble Gas What's in a name? For the Greek god of the sun, Helios . Say what? Helium is pronounced as HEE-lee-em . History and Uses: Helium, the second most abundant element in the universe, was discovered on the sun before it was found on the earth. Pierre-Jules-César Janssen, a French astronomer, noticed a yellow line in the sun's spectrum while studying a total solar eclipse in 1868. Sir Norman Lockyer, an English astronomer, realized that this line, with a wavelength of 587.49 nanometers, could not be produced by any element known at the time. It was hypothesized that a new element on the sun was responsible for this mysterious yellow emission

Definition of Hydrogen What is the definition of Hydrogen? It is a colorless, highly flammable gaseous element, the lightest of all gases and the most abundant element in the universe. The Physical and Chemical Properties are the characteristics of a substance, like Hydrogen, which distinguishes it from any other substance.  Most common substances, like Hydrogen, exist as States of Matter as solids, liquids, gases and plasma. Refer to the article on Hydrogen Element for additional information and facts about this substance. Hydrogen Properties - What are the Physical Properties of Hydrogen? What are the Physical Properties of Hydrogen? The Physical properties of Hydrogen are the characteristics that can be observed without changing the substance into another substance. Physical properties are usually those that can be observed using our senses such as color, luster, freezing point, boiling point, melting point, density, hardness and odor. The Physical Properties of Hydrog

An 85-year-old man was requested by his doctor for a sperm count as part of his physical exam. The doctor gave the man a jar and said, "Take this jar home and bring back a semen sample tomorrow." The next day the 85-year-old man reappeared at the doctor's office and gave him the jar, which was as clean and empty as on the previous day. The doctor asked, what happened and the man explained. "Well, doc, it's like this--first I tried with my right hand, but nothing. Then I tried with my left hand, but still nothing. Then I asked my wife for help. She tried with her right hand, then with her left, still nothing. She tried with her mouth, first with the teeth in, then with her teeth out, still nothing. We even called up Arleen, the lady next door and she tried too, first with both hands, then an armpit, and she even tried squeezin' it between her knees, but still nothing." The doctor was shocked! "You asked your neighbor?" The old man replied, "

  The nervous system is a complex collection of nerves and specialized cells known as neurons that transmit signals between different parts of the body. It is essentially the body’s electrical wiring. Structurally, the nervous system has two components: the central nervous system and the peripheral nervous system. According to the National Institutes of Health, the central nervous system is made up of the brain, spinal cord and nerves. The peripheral nervous system consists of sensory neurons, ganglia (clusters of neurons) and nerves that connect to one another and to the central nervous system. Functionally, the nervous system has two main subdivisions: the somatic, or voluntary, component; and the autonomic, or involuntary, component. The autonomic nervous system regulates certain body processes, such as blood pressure and the rate of breathing, that work without conscious effort, according to Merck Manuals. The somatic system consists of nerves that connect t

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The final mathematical quantity discussed in Lesson 1 is acceleration. An often confused quantity, acceleration has a meaning much different than the meaning associated with it by sports announcers and other individuals. The definition of acceleration is: Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity. Sports announcers will occasionally say that a person is accelerating if he/she is moving fast. Yet acceleration has nothing to do with going fast. A person can be moving very fast and still not be accelerating. Acceleration has to do with changing how fast an object is moving. If an object is not changing its velocity, then the object is not accelerating. The data at the right are representative of a northward-moving accelerating object. The velocity is changing over the course of time. In fact, the velocity is changing by a constant amount - 10 m/s - in each s

Just as distance and displacement have distinctly different meanings (despite their similarities), so do speed and velocity. Speed is a scalar quantity that refers to "how fast an object is moving." Speed can be thought of as the rate at which an object covers distance. A fast-moving object has a high speed and covers a relatively large distance in a short amount of time. Contrast this to a slow-moving object that has a low speed; it covers a relatively small amount of distance in the same amount of time. An object with no movement at all has a zero speed understanding of these formulas with the following problem: er walks 4 meters East, 2 meters South, 4 meters West, and finally 2 meters North. The entire motion lasted for 24 seconds. Determine the average speed and the average velocity. eed ofsidelines. The diagram below shows several of coach's positions at various times. At each marked position, the coach makes a ........... CONTINUE RE

Distance and displacement are two quantities that may seem to mean the same thing yet have distinctly different definitions and meanings. Distance is a scalar quantity that refers to "how much ground an object has covered" during its motion. Displacement is a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position. To test your understanding of this distinction, consider the motion depicted in the diagram below. A physics teacher walks 4 meters East, 2 meters South, 4 meters West, and finally 2 meters North. Even though the physics teacher has walked a total distance of 12 meters, her displacement is 0 meters. During the course of her motion, she has...... READ MORE