A stable atom is an atom that has enough binding energy to hold the nucleus together permanently . An unstable atom does not have enough binding energy to hold the nucleus together permanently and is called a radioactive atom.
What is the meaning of stability in chemistry?
Chemical stability is the resistance to attachment by chemical action . In materials science, a chemical substance is said to be stable if it is not particularly reactive in the environment or during normal use, and retains its useful properties on the timescale of its expected usefulness.
What are the stable compounds?
A compound is thermodynamically stable if it has lower enthalpy than any isochemical mixture of the elements or other compounds . Such stable compounds form the convex hull.
What determines the stability of a molecule?
Molecules (or resonance forms) with the negative charge on a more electronegative atom (and conversely positive charges on more electropositive atoms) are more stable than the alternatives. Exception: For atoms in different rows, having a negative charge on the larger atom is often preferable.
What is stability in chemistry class 9?
The solute particles cannot be separated from the mixture by the process of filtration. The solute particles do not settle down when left undisturbed , that is, a solution is stable.
What does stable mean in science?
Scientific definitions for stable
stable. [ stā′bəl ] Not susceptible to a process of decay , such as radioactivity. For example, the most common isotope of carbon, carbon 12, is stable. Protons and photons are examples of stable subatomic particles.
What is meant by stable element?
In this definition, “stable” means a nuclide that has never been observed to decay against the natural background . Thus, these elements have half lives too long to be measured by any means, direct or indirect. Stable isotopes: 1 element (tin) has 10 stable isotopes. ... 26 elements have 1 single stable isotope.
Is bromine stable or unstable?
Natural bromine is a mixture of two stable isotopes : bromine-79 (50.54 percent) and bromine-81 (49.46 percent). Of the 17 known radioactive isotopes of the element, bromine-77 has the longest half-life (57 hours).
What does stable mean in periodic table?
Answered 6 years ago. A stable element by definition is a chemical element (found on the Periodic Table) that has atleast one stable, naturally occurring isotope . For example, Helium has 9 isotopes, but since two of them are stable (He-3 and He-4), Helium is considered to be a stable element.
Is H2 stable?
Bond strength is proportional to bond order and stability depends on bond strength. Hence, H2 is more stable than H2^+ .
How do you calculate stability in chemistry?
- The greater the number of covalent bonds, the greater the stability since more atoms will have complete octets.
- The structure with the least number of formal charges is more stable.
- The structure with the least separation of formal charge is more stable.
What does stable mean in atoms?
An atom is stable if the forces among the particles that makeup the nucleus are balanced . An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. Instability of an atom’s nucleus may result from an excess of either neutrons or protons.
What affects stability in chemistry?
5.1 Chemical Reaction Mechanism
Chemical stability and the resistance of a glass to any chemical attack depend on factors like the solution type, exposure time and temperature, and condition of the glass surface .
Which molecule is the most stable?
Besides N2 , the thermodynamically most stable Nn molecules, located with the help of a newly developed energy increment system, are all based on pentazole units.
Which structure is the most stable?
Triangle is most stable structure. If u apply force on any link or joint the net force is distributed all over the structure ie sides and joints. This means all sides and joint experience force thus the force is distributed and this makes it more rigid and stable structure.
What is the meaning of unstable in chemistry?
What Does Chemical Instability Mean? Chemical instability is the reactive and decomposition ability of substances or species . ... Compounds or mixtures that are chemically unstable are often called labile. Chemical instability also causes corrosion of materials because of matter’s preference to stay in a stable condition.
What does stability and change mean?
Stability, change, and sustainability
Systems are stable when all of the inputs and outputs are in balance so that internal processes can continue at a steady state . Change occurs when the inputs and outputs are not in balance so that internal processes are also changing.
What is stability discuss?
What is Stability? A system is said to be stable, if its output is under control . Otherwise, it is said to be unstable. A stable system produces a bounded output for a given bounded input. The following figure shows the response of a stable system.
What are Carbanions give example?
Carbanions: Carbanions may be defined as negatively charged ions, in which carbon is having a negative charge and it has eight electrons in the valence shell. For example, ... Amongst primary (1°) secondary (2°) and tertiary (3°) carbanions, 1° is the most stable.
What is stability and example?
Stability is the state of being resistant to change and not prone to wild fluctuations in emotion. An example of stability is a calm, stable life where you don’t have wild ups and downs .
What is stability in biology?
Stability (of ecosystem) refers to the capability of a natural system to apply self—regulating mechanisms so as to return to a steady state after an outside disturbance .
Who explain the stability of atom?
Stability of an atom was successfully explained by Rutherford’s atomic model.
What is the difference between stable and unstable isotopes?
Stable isotopes are naturally occurring forms of elements that are non-radioactive. Unstable isotopes are atoms having unstable nuclei. Therefore, these elements undergo radioactivity . This is the main difference between stable and unstable isotopes.
Are ions stable?
Ions are not stable , they are in excited state. The fact that they exist as ions means that they need to gain lose or share electrons to attain a stable electronic configuration and duplet or octet valence shell structure resembling that of noble gases.
Is chlorine a gas?
Chlorine is an element used in industry and found in some household products. Chlorine is sometimes in the form of a poisonous gas . Chlorine gas can be pressurized and cooled to change it into a liquid so that it can be shipped and stored. ... Chlorine gas appears to be yellow-green in color.
Who named potassium?
| Discovery date 1807 | Origin of the name The name is derived from the English word ‘ potash ‘. | Allotropes |
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Why is carbon 14 unstable?
Because carbon-14 has six protons, it is still carbon, but the two extra neutrons make the nucleus unstable . In order to reach a more stable state, carbon-14 releases a negatively charged particle from its nucleus that turns one of the neutrons into a proton.
Why is carbon 13 stable?
Isotopes of Carbon
The next heaviest carbon isotope, carbon-13 ( 13 C), has seven neutrons. Both 12 C and 13 C are called stable isotopes since they do not decay into other forms or elements over time .
Is B2 stable?
B2 is a known molecule in gas phase, although not very stable , whose existence has been predicted in terms of MOT because it has a Bond Order greater than zero (in the case of B2, the bond order is 1).
What type of element is na?
| atomic number 11 | atomic weight 22.9898 | melting point 97.81 °C (208 °F) | boiling point 882.9 °C (1,621 °F) | specific gravity 0.971 (20 °C) |
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What element is most stable?
The noble gases are the chemical elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons their outer shell can hold. Therefore, they rarely react with other elements since they are already stable.
Is O2 stable or unstable?
So, for the oxygen atom to be stable it requires two more electrons in the valence shell. The oxygen atom forms a covalent bond with another atom of oxygen and shares 2 electrons in order to make the valence shell electrons to be equal to 8. An oxygen molecule(O 2 ) with two atoms of oxygen is stable.
Is h22 stable?
For H 2 , bond order = 1/2 (2-0) = 1, which means H 2 has only one bond. ... Thus, H 2 is a stable molecule .
What is stability solution?
In terms of the solution of a differential equation, a function f(x) is said to be stable if any other solution of the equation that starts out sufficiently close to it when x = 0 remains close to it for succeeding values of x. ... If a solution does not have either of these properties, it is called unstable.
Why is the stability of a compound important?
Why is the stability of a compound important? ... To ensure that the correct dosage/amount of medication is distributed throughout the compound and to the patient .
Why is stability a chemical property?
Chemical Stability
This is a property of matter that is determined by its specific conditions, so it can’t be observed without exposing a sample to that situation . Thus, chemical stability fits the definition of a chemical property of matter.
Is water stable or unstable?
The tremendous energy that is released is a signal that hydrogen and oxygen are very eager to become water. Another way of saying that is that water is an extremely stable compound , compared with loose molecules of hydrogen and oxygen. It is hard to break water molecules apart into its components.
What is basicity and acidity?
The acidity of bases is the number of hydroxyl ions that the basic molecule can produce in the aqueous solution. The basicity of the acids is the number of hydronium ions that the compound can produce in the aqueous solution . ... The measure of acidity is the pH scale.
Why is hydrogen unstable?
If we talk about the chemical stability of Hydrogen in its natural form then it is unstable. This is because Hydrogen has one electron in its lowest energy level meaning it has an unstable arrangement . ... On the other hand, isotopes of hydrogen such as Protium and deuterium are quite stable.
Why is tritium unstable?
Tritium is a radioactive form, or “isotope”, of hydrogen. It has two neutrons where regular hydrogen does not have any , which makes tritium unstable and therefore radioactive. ... As it decays it gives off, or emits, beta radiation.
Is no stable or unstable?
Nitric oxideNitric oxide (NO) is an example of a stable free radical . It does not obey the octet rule on the nitrogen atom. Each line around the atoms represents a pair of electrons.
