cesium (Cs), also spelled caesium, chemical element of Group 1 (also called Group Ia) of the periodic table, the alkali metal group, and the first element to be discovered spectroscopically (1860), by German scientists Robert Bunsen and Gustav Kirchhoff, who named it for the unique blue lines of its spectrum (Latin …
Is Cs solid or liquid?
Cesium is a chemical element with symbol Cs and atomic number 55. Classified as an alkali metal, Cesium is a solid at room temperature.
Why does Cs have high reactivity?
The higher the effective nuclear charge is, the greater the attraction is between electrons and the nucleus. Cesium’s low effective nuclear charge indicates that the nucleus does a poor job of attracting its electrons. Both of these factors make cesium extremely reactive.
What are the chemical properties of Cs?
It is silvery gold, soft, and ductile. It is the most electropositive and most alkaline element. Cesium, gallium, and mercury are the only three metals that are liquid at or around room temperature. Cesium reacts explosively with cold water, and reacts with ice at temperatures above -116°C.
What is Cs in chemistry thermodynamics?
We define specific heat capacity (or simply specific heat; Cs or s in units of J/g∙K) as the amount of energy required to raise the temperature of 1 g of a substance by 1 K. • If the amount is one mole, it is the molar. heat capacity. Cs = s = q.
What are physical properties of CS?
Physical properties Cesium is a silvery-white, shiny metal that is very soft and ductile. Ductile means capable of being drawn into thin wires. Its melting point is 28.5°C (83.3°F). It melts easily in the heat of one’s hand, but should never be handled that way!
What happens when you put cesium in water?
When caesium makes contact with water, it reacts very rapidly, and forms a colourless solution of caesium hydroxide (CsOH) and hydrogen gas (H2). This reaction is so fast, that if you tried pouring water into a test tube containing caesium (don’t do it), the glass container would shatter all over the place.
Does CS form a basic solution in water?
It forms a basic solution in water and d. It is very reactive as a metal. Cesium is an alkali metal which belongs to Group 1 of the periodic table.
Is CS more reactive than na?
Cesium undergoes the same reaction in water as lithium, sodium, and potassium, but even more violently; because cesium is a very large atom, the outermost electron is lost very easily, and the process is extremely exothermic.
Is cesium the most reactive?
The most reactive metal on the periodic table is francium. Francium, however, is a laboratory-produced element and only minute quantities have been made, so for all practical purposes, the most reactive metal is cesium.
What is the charge for Cs?
Answer and Explanation: A cesium ion will have a charge of 1+, meaning it is a cation with a positive charge of one.
Why does cesium have a low melting point?
Now, because of that very large size of Cesium, it has very weak interatomic interactions and as a result the metallic bond between two Cesium atoms becomes very weak. So, cesium melts at lower temperature compared to sodium or potassium or rubidium.
What is C in specific heat capacity?
In SI units, specific heat capacity (symbol: c) is the amount of heat in joules required to raise 1 gram of a substance 1 Kelvin. It may also be expressed as J/kg·K. Specific heat capacity may be reported in the units of calories per gram degree Celsius, too.
What is heat capacity vs specific heat?
Heat capacity is the amount of heat required to raise the temperature of an object by 1oC. The specific heat of a substance is the amount of energy required to raise the temperature of 1 gram of the substance by 1oC.
What is CP in heat transfer?
Cp. In a system, Cp is the amount of heat energy released or absorbed by a unit mass of the substance with the change in temperature at a constant pressure. In other words, under constant pressure, it is the heat energy transfer between a system and its surroundings.
Can water dissolve caesium?
Cesium salts and most cesium compounds are generally very water soluble, with the exception of cesium alkyl and aryl compounds, which have low water solubility.
How reactive is cesium?
Don’t let its lavish looks fool you, this stuff reacts with just about anything. Cesium, or caesium, is an alkali metal on the periodic table with the atomic number 55. It is highly reactive and pyrophoric, meaning that the mere oxygen in the atmosphere is sufficient to make it go up in flames.
Is cesium soluble in water?
Cesium in the Environment Because Cs-137 bonds with chlorides to make a crystalline powder, it reacts in the environment like table salt (sodium chloride): Cesium moves easily through the air. Cesium dissolves easily in water.
Can cesium explode in water?
Cesium: Cesium explodes on contact with water, possibly shattering the container. Cesium hydroxide and hydrogen are formed.
How does Cs react with water?
Caesium (cesium in USA) metal reacts rapidly with water to form a colourless basic solution of caesium hydroxide (CsOH) and hydrogen gas (H2). The reaction continues even when the solution becomes basic. The resulting solution is basic because of the dissolved hydroxide.
Can cesium be used in a bomb?
According to a March 2002 Washington Post report, the Bush administration’s consensus view was that al-Qaeda had radioactive contaminants, such as strontium 90 and cesium 137, which could be used to make a dirty bomb.
How many electrons are in Cs?
Caesium atoms have 55 electrons and the shell structure is 2.8. 18.18. 8.1.
Why boiling point of Cs is more than RB?
As we know, The boiling points decrease going down group 1 because the atoms get larger. So cs have more boiling point than rb. In other words, Boiling point is directly proportion to the molecular weight, because when molecular wt.
Why caesium is liquid at room temperature?
They are francium, cesium, gallium, and rubidium (all metals). The reason these elements are liquids has to do with how tightly bound their electrons are to the atomic nucleus. Basically, the atoms don’t share their electrons with nearby atoms, so it is easy to separate them from solids into liquids.
What is the melting and boiling point of caesium?
Melting point of Caesium is 28.4°C. Boiling point of Caesium is 669°C. Note that these points are associated with the standard atmospheric pressure. In thermodynamics, saturation defines a condition in which a mixture of vapor and liquid can exist together at a given temperature and pressure.