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What is the definition of metallic radius?

Metallic radii trend larger going down the periodic table. This is because there are more valence electrons, and the electron cloud is larger with heavier elements. The metallic radius gets smaller going from left to right across the periodic table because there are more protons in the nucleus of the atom. More protons hold more electrons in tighter orbits, so the measurement is smaller. Metallic radii are measured in elements such as lithium, magnesium, beryllium, calcium, potassium, cesium, barium and more. These are groups IA and IIA on the periodic table of the elements.\nIn general, an at..

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What is replication in biology?

At the end of replication, the genetic material of a mother cell duplicates, and each daughter cell receives a copy. Cellular organelles also undergo replication. Replication ensures the transfer of genetic material from mother to daughter cells.\nA part of the replication process is known as the replication fork. The process involves many enzymes, which includes an 11-sub-unit collective referred to as CMG, which untangles and separates the DNA into two strands. The replication fork resembles a zipper, with CMG appearing like a zipper slider and the individual strand appearing like the two ro..

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What causes electrical resistance in metals?

Metals are good conductors of electricity. Electrons in atoms hold atoms together in a crystal structure. When electrons move up to the surface of a material, they move freely to conduct electricity when a charge is applied to the substance. In metal, electrons move readily from the valence band, where they usually reside, to the conduction band, where they are free to move through the material. This allows electrons to move freely carrying an electrical charge. Because of this, metals are commonly used to make wires and other devices to carry electrical current.\nOn the other hand, metals are..

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What is zooplankton?

Zooplankton are one of the basic elements of the marine food web. One commonly known plankton is krill, which is eaten by whales. There are many different types of zooplankton that are distinct from one another. For example, meroplankton are only considered plankton during one phase of their lives. Meroplankton are larvae that grow into full-sized animals, such as fish, insects and mollosks. Holoplankton remain classified as plankton throughout all of their life stages and include larvaceans and copepods.

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What is a limiting reactant?

A limiting reactant determines the amount of product that is formed after a chemical reaction process takes place. If another substance remains after the reaction, it is normally called an excess reactant. This is because it has nothing to react with in order to produce an end product.To find the difference between these two, calculations must be made to determine which of the two substances produces more on its own. A limiting reactant will normally produce the lesser amount of the end product when compared to an excess reactant.If, for example, four tires and four headlights are needed to co..

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How do you equate 180 kph to mph?

People who travel a kilometer per hour are traveling a slightly shorter distance than people who travel a mile per hour because a kilometer is shorter than a mile. Kilometers per hour are a measurement of a slightly faster speed than miles per hour because there are more kilometers required to take up the same distance than miles. Kilometers are a common form of measurement in countries that utilize the metric system as their main means for measuring distances. Countries that utilize the metric system will often have road signs that dictate the speed drivers should be traveling in kilometers p..

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What is the circle of illumination?

The circle of illumination divides the Earth in exactly half. It is a line that is able to be seen from space, and the exact location of the line is dependent on the various seasons. Because the Earth turns on its axis, and the circle of illumination stays in the same general position, the Earth is actually moving around the circle, but it appears that the circle is changing positions. The way that the Earth turns in relation to the circle of illumination is the main determining factor behind how many hours it is light or dark out.\n\nThe circle of illumination also plays a small part on the s..

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When was coal discovered?

The first commercial mining operation began in 1748 in Virginia and in 1750 in Kentucky by Dr. Thomas Walker. Coal served as one of the earliest sources of light and heat once the English discovered that coal produced fuel that burned hotter and cleaner than wood charcoal. Coal was a key component of new technologies during the Industrial Revolution and served as a worldwide energy supplier.

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How is acid rain produced?

Acid rain is sometimes referred to as acid deposition, a term that also encompasses other forms of acidic precipitation such as snow. It can occur as a result of both human and natural activities. Most of gases that lead to acid rain are typically by-products of burning fossil fuels and electric power generation. Erupting volcanoes also release chemicals that lead to acid deposition.Acid rain leads to the acidification of streams and lakes, which directly endangers aquatic life. It also leads to the destruction of trees and sensitive forest soils. Acid deposition has negative impacts on archit..

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What are the different blood types and how rare are they?

Blood type is a trait controlled by genes, and it denotes the presence or absence of different chemical markers found in the blood of people with those genes. The letters "A" and "B" each designate a certain type of antigen found on the surface of red blood cells of people with those genes. Their presence depends on the particular allele of the same gene. Since humans have two copies of each gene, one from each parent, a person can produce both markers and have type AB blood. The letter "O" designates a third variation of this gene that does not produce antigens on the surface of blood cells.\..

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