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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
Is terbium a metal or non metal?
Yttrium (symbol Y) is a metal. It belongs to transition metal series.
What is the atomic number for strontium chloride?
The atomic number for strontium chloride is determined by the element strontium, which has an atomic number of 38. Since chloride is an anion with a charge of -1, it does not affect the overall atomic number of the compound.
Where are 2 places multivalent metals are on the periodic table?
Two places on the periodic table where multivalent metals are located are Group 4 (e.g. Titanium, Zirconium) and Group 13 (e.g. Aluminum, Gallium). These metals can exhibit different oxidation states, hence being multivalent.
What elements are the group A elements?
Group A elements are also known as the main group elements and include the alkali metals, alkaline earth metals, and elements in groups 13-18 of the periodic table. This represents the s-block and p-block elements. Examples include helium, lithium, sodium, and oxygen.
A rickety table is a table that is shaky, unstable, or in poor condition due to loose or weak joints, legs, or other structural components. It may wobble or creak when pressure is applied to it.
How do you set up a pingpong table?
To set up a pingpong table, first assemble the table components according to the manufacturer's instructions. Then, ensure the table is placed on a flat surface with sufficient space around it for players to move freely. Adjust the net height and tension, and you're ready to play!
What is the biggest atomic number?
The atom discovered with the highest atom number = number of proton = number of electrons
Note that some negative ions might be bigger.
The biggest element so far discovered is 294Uuo (Ununoctium, element 118), a superheavy transactinide element. Only a small number of atoms of this element have ever been produced.
The caesium atom with an empirical radius of 260 pm.
in a periodic table
1>from left to right across a periodic table
ionization energy increases & atomic radii decreases
2>from top to bottom along a group
ionization energy decreases and atomic radii increases
when considering the periodic table from left to right the main energy level is the same,but the number of electrons and protons increases.so the nuclear attraction increases and thus the electrons are pulled closer towards the nucleus.this decreases the atomic radii and increases the amount of energy needed to remove the electron in the outer most shell from the strong attraction.that is the ionization energy increases and atomic radii decreases when going from left to right across the period
when going down the group in a periodic table the electronic configuration of elements increases by 1 shell.that is the number of main energy levels increases.so the nuclear attraction between the atomic nuclei and the last electron decreases due to the increase in the distance.therefore it is more easier to remove the electron in the outer most shell of an element than that of the element immediately above it.therefore the ionization energy increases down the group.and since number of energy levels increases the atomic radius increases.
What are descriptions of a polyatomic ion?
Polyatomic ions are groups of atoms that carry a net electric charge, acting as a single unit in chemical reactions. They have a specific combination of atoms and often have characteristic properties that distinguish them from individual ions or molecules. Examples include sulfate (SO4^2-), nitrate (NO3^-), and ammonium (NH4^+).
Is solid a physical or chemical change?
Neither. A physical change is changing something's tangible properties, such as shape or state of matter (solid, liquid, or gas), while a chemical change is turning something into something else entirely. For example, water freezing into ice is a physical change, but cake batter turning into cake is a chemical change. So, if it's the same thing that you start with as a liquid or gas and it simply becomes a solid, it's a physical change. If it becomes something else entirely, it's a chemical change. I hope that helped.
What is the set of numbers that is used to identify the element?
The atomic number generally. the atomic number is the number of protons(or electrons) an atom has.
Who made the first periodic table and how did he?
Dmitri Mendeleev is credited with creating the first periodic table in 1869. He arranged the elements by increasing atomic mass and noticed a pattern in the properties of elements when organized this way, leading to his periodic table.
What is the short for sulfate in the periodic table?
The chemical symbol for sulfate in the periodic table is SO4.
Which group on the periodic table never forms a chemical bond?
Group 18 (noble gases), because there outer energy level is full
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).
