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Periodic Table
The Periodic Table is a tabular arrangement of the elements in increasing order oftheir atomic numbers, so that elements with similar properties are in the same column. There are 18 columns, called groups, and seven rows, which are called periods, in the modern periodic table. Questions about the Periodic Table: its history and creation, trends, groups/families, and periods are asked in our Periodic Table category.
11,356 Questions
What group does iron belong in the periodic table?
Iron belongs to Group 8 and period 4 in the periodic table. It is a transition metal with the chemical symbol Fe and atomic number 26.
When a formula of a compound is said to be molecule?
This questions doesn't make much sense, but a molecule is considered to be 2 or more atoms covalently bonded together to form a neutral compound.
A molecular formula is a way of writing the chemical makeup of a molecule. Thus, methanol is a molecule and it's molecular formula is COH4
Why are there two rows of elements below the periodic table?
The two rows below the main periodic table are the lanthanides and actinides. These elements are placed separately to prevent the table from becoming too wide. Lanthanides start at atomic number 57, while actinides start at atomic number 89.
First don't you mean Radon, Because Raydon is a village and civil parish in Suffolk, England. Located around two miles south-east of Hadleigh, it is part of Babergh district.While Radon is an element on the periodic table. Radon is a colorless, odorless, tasteless, naturally occurring, radioactive noble gas that is formed from the decay of radium. It is one of the heaviest substances that remains a gas under normal conditions and is considered to be a health hazard. The most stable isotope, 222Rn, has a half-life of 3.8 days and is used in radiotherapy. While having been less studied by chemists due to its high radioactivity, there are a few uses of this generally unreactive element:
Two uses are:
Medical Uses
It has been said that exposure to radon gas mitigates auto-immune diseases such as arthritis (due to radiation's suppressing effects on the immune system). As a result, in the late 20th century and early 21st century, some "health mines" were established in Basin, Montana which attracted people seeking relief from health problems such as arthritis through limited exposure to radioactive mine water and radon. The practice is controversial because of the "well-documented ill effects of high-dose radiation on the What_are_some_common_uses_for_radon_gas."
In addition to personal testimonies of arthritis relief and other benefits, there is some scientific evidence for this belief, known as hormesis. However, the general scientific community finds it unsubstantiated. There is no known biological mechanism by which such an effect could occur. In addition, it conflicts with the internationally recognized standard that there is no safe threshold for radiation exposure and that exposure should be limited to that "as low as reasonably achievable".
The radon gas which is used as a cancer treatment in medicine is obtained from the decay of a radium chloride source. In the past, radium and radon have both been used for X-ray medical radiography, but they have fallen out of use as they are radiotoxic alpha radiation emitters which are expensive and have been replaced with iridium-192 and cobalt-60 since they are far better photon sources.
Scientific Uses
Radon emanation from the soil varies with soil type and with surface uranium content, so outdoor radon concentrations can be used to track air masses to a limited degree. This fact has been put to use by some atmospheric scientists. Because of radon's rapid loss to air and comparatively rapid decay, radon is used in hydrologic research that studies the interaction between ground water and streams. Any significant concentration of radon in a stream is a good indicator that there are local inputs of ground water. Radon is also used in the dating of oil-containing soils because radon has a high affinity of oil-like substances.
Radon soil-concentration has been used in an experimental way to map buried close-subsurface geological faults because concentrations are generally higher over the faults. Similarly, it has found some limited use in geothermal prospecting. Some researchers have also looked at elevated soil-gas radon concentrations, or rapid changes in soil or groundwater radon concentrations, as a predictor for earthquakes. Results have been generally unconvincing but may ultimately prove to have some limited use in specific locations.
Radon is a known pollutant emitted from geothermal power stations, though it disperses rapidly, and no radiological hazard has been demonstrated in various investigations. The What_are_some_common_uses_for_radon_gasin geothermal plants is to reinject all emissions by pumping deep underground, and this seems likely to ultimately decrease such radon hazards further.
What are the properties of reactivity?
Reactivity is the tendency of a substance to undergo a chemical reaction. It is influenced by factors such as electron configuration, atomic size, and electronegativity. Highly reactive substances tend to form bonds easily and participate in reactions readily.
Au3P is the chemical formula for gold(I) phosphaethyne, a compound containing gold and phosphorus. It is a rare and unstable compound that has been studied for its unique chemical properties.
Why NH group is more reactive than OH group?
The NH group is more reactive than the OH group because the lone pair on nitrogen in NH group is less stable due to the higher electronegativity of nitrogen compared to oxygen. This makes the lone pair in the NH group more readily available for reactions compared to the OH group. Additionally, the smaller size of nitrogen allows for stronger interactions with other atoms or molecules, increasing reactivity.
Is it true that in chemical reactions metal atoms usually become positively charged ions?
Yes, in chemical reactions, metal atoms tend to lose electrons to form positively charged metal ions. This is because metals have low ionization energies, making it easier for them to lose electrons and achieve a stable electron configuration.
What was john Dalton remembered for?
John Dalton is remembered for his development of modern atomic theory, where he proposed that all matter is made up of tiny indivisible particles called atoms. He also introduced the concept of atomic weights and laid the foundation for understanding chemical reactions as interactions between atoms.
Is There are two different ways to number the groups of the periodic table?
Yes, there are two main ways to number the groups on the periodic table: the IUPAC (International Union of Pure and Applied Chemistry) numbering system, which numbers groups from 1 to 18, and the older, simpler system which numbers groups from 1 to 8 (with some groups further divided into subgroups A and B).
How would you describe the elements that are listed after plutonium?
The elements listed after plutonium on the periodic table are americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, lawrencium. These elements belong to the actinide series and are synthetic, meaning they are not found in nature but are produced in laboratories through nuclear reactions.
How many isotopes does the element astatine from the periodic table have?
Astatine, a radioactive element found in the halogen group, has at least 20 known isotopes. However, only one of these isotopes, Astatine-210, is considered stable. The other isotopes are unstable and undergo radioactive decay.
What is an element in the s block or p block of the periodic table?
An element in the s block of the periodic table includes metals like sodium and potassium, while an element in the p block includes nonmetals like oxygen and nitrogen. These elements are characterized based on their outer electron configuration, which determines their chemical properties and reactivity.
What does MD mean in the periodic table?
MD stands for a Mendelevium, which is a synthetic element with the atomic number 101 on the periodic table. It belongs to the actinide series and is named after Dmitri Mendeleev, the scientist who first proposed the periodic table.
What is the basis of arranging the elements in the periodic table?
Elements in the periodic table are arranged based on their atomic number, which represents the number of protons in the nucleus of an atom. This arrangement helps to group elements with similar properties together in periods and groups.
What are the types of learning-gaps?
There are generally three types of learning gaps: content knowledge gaps (lack of understanding of subject matter), skill gaps (lack of proficiency in performing specific tasks), and cognitive skill gaps (lack of critical thinking or problem-solving skills). Identifying and addressing these gaps is important for effective learning and academic success.
it is the chemical formula for a "truth serum" which makes a person talkative and tell the truth
What on the periodic table means 5cent from americia?
The element Nickel (Ni) on the periodic table represents 5 cents from America, as the coin "nickel" is made from a combination of copper and nickel metal.
What happens if sodium ion is sprayed over the flame?
When sodium ions are sprayed over a flame, they impart a yellow-orange color to the flame due to excitation of the sodium atoms. This phenomenon is used in flame testing to identify the presence of sodium in a sample.
Where is Quadium located on the periodic table?
There is no element named quadium. There is ununquadium (Element 114), which is its underneath lead and to the right of ununtrium. There was an element named Unnilquadium, but it is now Rutherfordium (Rf). Due to how that type of element name works, Quadium would simply be Element #4--which was discovered in 1798 and was named Beryllium thirty years later.
What did Dmitri Mendeleev arrange into a systematic chart?
Dmitri Mendeleev arranged the known chemical elements into a systematic chart known as the periodic table. His arrangement was based on the elements' atomic mass and chemical properties, leading to the organization of elements in periods and groups. Mendeleev's periodic table laid the foundation for the modern understanding of the relationship between elements.
What group of nonmetals are the most reactive and why are they the most reactive?
The halogens, periodic table column 17, are the most reactive nonmetals, because they have the highest electronegativities and therefore can strongly attract electrons from almost any other elements.
What is eleventh element on the periodic table?
Sodium is the eleventh element on the periodic table.
What two groups of the periodic table are most similar in chemical properties?
The alkali metals (Group 1) and the alkaline earth metals (Group 2) are most similar in chemical properties due to both groups having similar metallic properties, reactivity, and ability to form cations with a +1 or +2 charge.
What was the element named after the scientist who first put elements into a table?
There are 13 elements named after people, although only 12 of the names are formally accepted by the International Union of Pure and Applied Chemistry (IUPAC). * bohrium (Bh, 107) - Niels Bohr * curium (Cm, 96) - Pierre and Marie Curie * einsteinium (Es, 99) - Albert Einstein * fermium (Fm, 100) - Enrico Fermi * gallium (Ga, 31) - both named after Gallia (Latin for France) and its discoverer, Lecoq de Boisbaudran (le coq, the French word for 'rooster' translates to gallus in Latin) * hahnium (105) - Otto Hahn (Dubnium, named for Dubna in Russia, is the IUPAC-accepted name for element 105) * lawrencium (Lr, 103) - Ernest Lawrence * meitnerium (Mt, 109) - Lise Meitner * mendelevium (Md, 101) - Dmitri Mendeleev * nobelium (No, 102) - Alfred Nobel * roentgenium (Rg, 111) - Wilhelm Roentgen (formerly Ununumium) * rutherfordium (Rf, 104) - Ernest Rutherford * seaborgium (Sg, 106) - Glenn T. Seaborg
