The task of steels Classifying Metals based on Activity
Predicting the Product of Main group Metal reaction

The task ofMetals

The main difference between metals is the ease v whichthey experience ubraintv-jp.comical reactions. The facets toward the bottomleft corner of the periodic table are the metals that are themost active in the feeling of gift the many reactive.Lithium, sodium, and potassium all react v water, for example.The price of this reaction rises as we go down this column,however, since these elements become an ext active as they becomemore metallic.

You are watching: Most reactive metal on the periodic table

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Classifying MetalsBased top top Activity

The steels are often separated into four classes on the communication oftheir activity, as shown in the table below.

Common Metals separated into great on theBasis of your Activity


Class i Metals: The energetic Metals
Li, Na, K, Rb, Cs (Group IA)
Ca, Sr, Ba (Group IIA)
Class II Metals: The Less active Metals
Mg, Al, Zn, Mn
Class III Metals: The structural Metals
Cr, Fe, Sn, Pb, Cu
Class IV Metals: The Coinage Metals
Ag, Au, Pt, Hg

The most energetic metals are so reactive the they readilycombine with the O2 and also H2O vapor in theatmosphere and also are as such stored under an inert liquid, suchas mineral oil. These metals are uncovered exclusively in groups IAand IIA that the routine table.

Metals in the 2nd class room slightly much less active. Theydon"t react through water in ~ room temperature, yet they reactrapidly through acids.

The 3rd class includes metals such together chromium, iron, tin,and lead, i m sorry react only with strong acids. It additionally containseven less energetic metals such as copper, which only dissolves whentreated v acids that deserve to oxidize the metal.

Metals in the fourth course are so unreactive lock areessentially inert at room temperature. These metals are best formaking jewel or coins since they do not react with the vastmajority the the substances v which castle come into dailycontact. Together a result, they are often dubbed the "coinagemetals."

Predicting the Productof Main team Metal reaction

The product of plenty of reactions in between main team metals andother facets can be predicted indigenous the electron configurationsof the elements.

Example: consider the reaction between sodium and also chlorine toform sodium chloride. It takes much more energy to eliminate an electronfrom a sodium atom to type an Na+ ion 보다 we get backwhen this electron is included to a chlorine atom to kind a Cl-ion. Once these ions space formed, however, the force of attractionbetween these ions liberates enough energy to do the followingreaction exothermic.


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Ho = -411.3 kJ/mol

The net effect of this reaction is to transfer one electronfrom a neutral salt atom to a neutral chlorine atom to type Na+and Cl- ions that have actually filled-shell configurations.

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Potassium and hydrogen have actually the following electronconfigurations.


K: 4s1 H: 1s1

When these aspects react, one electron needs to be transferredfrom one element to the other. We can decide which aspect shouldlose one electron by comparing the very first ionization energy forpotassium (418.8 kJ/mol) through that for hydrogen (1312.0 kJ/mol).

Potassium is much more likely to lose anelectron in this reaction, which way that hydrogen benefit anelectron to form K+ and also H- ions.

See more: How Are Active Continental Margins Related To Plate Tectonics?

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Practice trouble 1:

Write a balanced equation because that the complying with reaction.

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