Alkali Metals

Alkali metals are the soft shiny metals that comprise group 1 on the periodic table.

2,190 Questions
Chemistry
Alkali Metals

How many alkali metals are there?

6: lithium(Li) ,sodium(Na) , potassium(K) , rubidium (Rb) , cesium (Cs) and Francium(Fr).

Practically,only the first five can be termed alkali metals,because there is not enough Francium in the planet to examine its characteristics. Of course, the electron structure of the atom of Francium "proposes" an alkali metal.

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Chemistry
Periodic Table
Alkali Metals

What are the names of the third alkali metal and the first transition metal?

Third alkali metal is potassium and first transition metal is scandium.

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Elements and Compounds
Atoms and Atomic Structure
Alkali Metals

How can the Bohr model of atomic structure be used to explain the reactivity of the alkali metals?

Bohr's model of the atom explains the reactivity of group 1 metals, as it applies the rule that electrons are in fixed orbits, and that the shells fill up from the centre. If each shell is full it can't take any more electrons so for an electron to migrate into an already full shell another electron must take its place. This means that there will always be one electron on the outside until it undergoes ionic bonding with a non-metal and becomes a stable positive ion.

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Acids and Bases
Alkali Metals

What are the Three most common alkali metals?

Sodium, lithium, potassium

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Elements and Compounds
Alkali Metals

Is potassium a metal alkali metal or a transition metal?

alkali metal

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Chemistry
Periodic Table
Alkali Metals

Why do the alkali metals react more violently as you go down the column in the periodic table?

Electron screening is the best reason for there being more reactivity as an investigator looks down the Group 1 elements, which are the Alkali metals. Let's take a step back and then come up to speed on this one. When any of the alkali metals react with water, they form a metal hydroxide, and that Group 1 element becomes the positive ion of that metal. The general reaction for any of the Alkali metals is this, where "M" is any metal: M + 2H2O --> M+ + 2OH- + H2.

For all the Group 1 elements, those Alkali metals, it is this same reaction. In going down the column, the elements' atomic numbers increase, and there are more and more electron shells in the atomic structure. The increasing number of electrons sets up a condition where the outer electrons are "screened" from the positive "pull" of the nucleus by other electrons in inner shells. These outer electrons can be "shed" or "loaned out" more easily if the nucleus isn't "hanging onto them" as tightly. Electronegativities speak to the "desire" of an element to react, and we see electronegativities decreasing as we go down the column. The further down the column you go, the more violently they react because the electronegativity of the atoms decreases down the column. Because the electronegativity is decreasing (and that is because of the increasing size of the outer electron orbitals and the screening of those outer orbitals by inner electrons), the electrons are more easily removed from the metal. That means that it is easier to form the ion, and said another way, they are more easily oxidized. That means that less energy is spent in the reaction pulling off the electron, and so the reaction is faster and more exothermic.

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Periodic Table
Elements and Compounds
Alkali Metals

What are the alkali metals?

They are the elements in the first column of the periodic table: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

See the Related Questions to the left for more information about the alkali metals and their properties.


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Elements and Compounds
Alkali Metals

Which alkali metal has no known uses?

Because of its rarity and very short half-life, francium has no known uses (at least not industrially).

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Chemistry
Periodic Table
Alkali Metals

What are the two most most important alkali metals?

Sodium and Potassium.

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Periodic Table
Alkali Metals

Why elements in the periodic table in group 1 are called alkali metals?

Group 1A elements are active metals. They are so active that they are never found free in nature. They are usually stored in oil. They form compounds with oxygen that dissolve in water to give solutions that are alkaline or caustic. They are called alkali metals, or simply the alkalis.

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Acids and Bases
Alkali Metals

What alkali metal is used to treat manic-depressive illness?

lithium

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Science Experiments
Elements and Compounds
Alkali Metals

Among the alkali metals the tendency to react with other substances?

Among the alkali metals, the tendency to react with other substances increases form top to bottom within the group.

Accompanying link shows the reaction from lithium through to cesium

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Chemistry
Alkali Metals

Why is it that as the atomic radius of the alkali metals increases their melting point decreases?

From BCIT.ca: The alkali metals show a decrease in melting points and boiling points due to the weaker metallic bonds between atoms as their size increase down the group.
From AUS-e-TUTE: melting point decreases down the Group as the elements become less metallic in nature
From okstate.edu: As one goes down the Periodic Table, the metallic radius of alkali metals increases. The increase in radius results in much decreased attractive forces between atoms within the liquid metals, resulting in a decrease in heat of vaporization and boiling points [and melting points] because less heat is needed to separate atoms from the liquid [or solid] state within the larger alkali metals. See Web Links to the left for the original sources.

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Elements and Compounds
Alkali Metals

What is the major difference between the colours of flames produced by alkali metal with that of calcium when performing flame tests?

I dont know!

Ancient Greek

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Acids and Bases
Alkali Metals

Which of the alkali metals are liquid at room temperature?

apparently due to another answer to a very similar question, all alkali metals are solid

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Acids and Bases
Alkali Metals

List all the alkali metals?

Lithium

Sodium

Potassium

Rubidium

Cesium

Francium

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Chemistry
Elements and Compounds
Acids and Bases
Alkali Metals

Two metals which float on water and react very quickly to form alkalis?

potassium, sodium and lithium

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Acids and Bases
Alkali Metals

What happens if you mix alkali metals with noble gasses?

Nothing will happen. The noble gases are inert meaning they are non-reactive. They have filled electron clouds.

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Chemistry
Periodic Table
Alkali Metals

Why alkali metals cannot be used in voltaic cells?

Alkali and Alkaline earth metals cannot be used in voltaic cells based on water as the solvent because of their rapid oxidation by that solvent.

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Energy
Atoms and Atomic Structure
Alkali Metals

What does alkali metal atom look like?

If you could see an alkali metal atom, it would have a nucleus containing protons and neutrons, and an electron cloud containing electrons. In the electron cloud, the highest energy level would contain only one electron.

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Periodic Table
Elements and Compounds
Alkali Metals

What is an alkali metal?

Mc

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Alkali Metals

Why is hydrogen not part of the alkali metal or halogen chemical family?

Hydrogen is not included because it only has one proton and electron, and therefore does not have the same reactive properties as say, lithium or Potassium.

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Acids and Bases
Alkali Metals

What alkali metal fewer than 10 protons in its nucleus?

mid

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Acids and Bases
Alkali Metals

Is copper a alkali metal?

No

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Acids and Bases
Alkali Metals

What is a formula of an alkali metal salt?

XBr, X2SO4, X3PO4

X= Li, Na, K, Rb, Cs, Fr

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