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The reactivity series is a systematic arrangement of metals and nonmetals in order of their decreasing chemical activity.

Also known as the activity series, it helps predict how a substance will react with others, particularly in displacement reactions.

This series determines the ability of a metal to replace another in a reaction and indicates how it interacts with oxygen, water (cold, hot, or steam), and acids.

Chemistry revolves around chemical reactions, where substances interact to form new products through transformative processes.

Element reactivity varies based on their position in the reactivity series, a key concept for understanding chemical processes.

This post will explore the significance of the reactivity series, how it influences chemical reactions, and its practical applications in everyday life. Let’s dive in!

METAL REACTIVITY SERIES

Definition of metal reactivity series –

Metal reactivity series is a list in which metals are arranged in the decreasing order of their chemical activity.

Reactivity Series of Metals

The metal activity or reactivity series finds its utility in the study of displacement reactions. It helps us to predict whether a particular metal can displace another metal from a compound or not.

In a displacement reaction, a metal higher up in the reactivity series displaces all other metals in a compound that lies below it. For example, zinc being more active than copper replaces copper sulfate in the solution state to form zinc sulfate and free copper.

The activity of a metal depends upon its capability to lose electrons in the solution state to form positive ions. The more readily metal loses its electrons, the more active it is, and the higher up it is in the reactivity series. Among the most commonly known metals, the most active cesium is at the top and the least active platinum is at the bottom of the reactivity series.

Special Features of the Reactivity or Activity Series of Metals:

1. The ease with which a metal in solution loses electrons and forms a positive ion decreases down the series, i.e., from cesium to platinum.
2. Although a non-metal, hydrogen is included in the reactivity series of metals. It is because, like metals, it too loses an electron and becomes a positively charged (H⁺) ion.
3. Metals at the top of the reactivity series can displace metals that are placed lower from their salt solutions.
4. The activity series facilitates the comparative study of the metals in terms of the degree of their reactivity.
5. Metals at the top of the reactivity series are difficult to obtain from their ores.

The table below explains the reactions of metals with oxygen (air), water, dilute acids, and other salt solutions, at various levels of the reactivity series.

Reactivity of metals with oxygen, water, and acids

NONMETAL REACTIVITY OR ACTIVITY SERIES

Definition of reactivity of nonmetals–

Nonmetal activity series is a list in which nonmetals are arranged in the decreasing order of their reactivity.

Similar to metals, we can also arrange nonmetals in terms of their reactivity. During displacement reactions, a more active nonmetal displaces a less active nonmetal from a compound.

Reactivity Series of Nonmetals

The activity of a nonmetal depends upon its capability to gain electrons in the solution state to form positive ions. The more readily a nonmetal gains electrons, the more active it is, and the higher up it is in the reactivity series.

Frequently Asked Questions

Q1. Which is the most active or reactive metal?

Ans. Cesium and francium are the most reactive metals and are at the top of the reactivity series. However, the quantity of francium produced until now is too small. Therefore, for all practical purposes, we consider cesium as the most reactive metal.

Cesium reacts with water. Video by Periodic Videos

Q2. Which is the least active or reactive metal?

Ans. Platinum is one of the least reactive metals and therefore lies at the bottom of the reactivity series. It has remarkable corrosion resistance, even at high temperatures, and is therefore considered a noble metal. Due to its low reactivity, it found uses in the manufacture of laboratory equipment, electrodes, platinum resistance thermometers, dentistry equipment, and jewelry.

Q3. Which is the most active or reactive nonmetal?

Ans. Fluorine is the most active nonmetal, and it displaces all other nonmetals in salt solutions.

Q4. What determines the reactivity of metals?

Ans. We determine the reactivity of metals based on their capability to lose electrons in the solution state to form positive ions or cations. Therefore, the more readily metal loses its electrons, the more active it is, and the higher up it is in the reactivity series.

Q5. What determines the reactivity of nonmetals?

Ans. We determine the reactivity of nonmetals based on their capability to gain electrons in the solution state to form negatively charged ions or anions. Therefore, nonmetals that gain electrons rapidly are more active than others.

Knowledge of chemistry is endless, so to know more about various types of chemical reactions. Click here

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Struggling to understand metals, nonmetals, and metalloids? Selftution.com – the #1 trusted educational website – breaks down their differences with clear comparisons, charts, and real-world applications. Master chemistry the easy way!

In the earlier post, Elements and Compounds, we learned that scientists have discovered a total of 118 elements so far. Among them, 94 elements are metals, 17 are nonmetals, and the remaining 7 elements are metalloids.

• Metals are generally shiny, good conductors of electricity, and malleable.
• Nonmetals tend to be dull, poor conductors, and brittle.
• Metalloids have properties that are intermediate between metals and nonmetals.

Understanding the Difference Between Metals, Nonmetals, and Metalloids is essential to grasping how elements behave in nature and their various uses.

Metalloids, for example, exhibit characteristics of both metals and nonmetals, making them unique in their properties.

In this blog, we will explore how these three categories differ in terms of physical and chemical properties, along with their practical applications in daily life.

The above demarcation between metals, nonmetals, and metalloids may vary since the nature of some elements is still under research.

Metals

Metals are hard, opaque, lustrous materials that are good conductors of heat and electricity. They are malleable and ductile, can withstand longitudinal pull, and produce a resonant sound when struck. They form basic oxides on reacting with the air and evolve hydrogen on reaction with water and dilute acids. Click here to know more about the physical and chemical properties of metal.

Nonmetals

Nonmetals are poor conductors of heat and electricity and are non-malleable and non-ductile. They do not exhibit luster and do not produce resonant sounds when struck. Nonmetals form acidic oxides when reacted with oxygen and do not evolve hydrogen when reacted with dilute acids. They are further divided into halogens and noble gases.

• Halogens: We derive the word halogen from  ‘hal‘, which means salt, and ‘gen,’ which means generation. Thus, halogens are salt producers, as they react with metals to form a range of salts. For example, NaCl, KBr, etc.
• Noble gases: These are 6 monoatomic gases, i.e., He, Ne, Ar, Kr, Xe, and Rn. They are chemically inert and almost inactive. Due to its inactive nature, we use argon in light bulbs to prevent the tungsten filament from oxidizing.

Click here to learn more about the physical and chemical properties of metal

Metalloids

Metalloids are those elements that show properties of both metals and nonmetals. They have physical and chemical properties intermediate between those of metals and nonmetals. Commonly recognized metalloids are Boron (B), Silicon (Si), Germanium (Ge), Arsenic (As), Antimony (Sb), and Tellurium (Te). The less commonly recognized metalloid is Polonium (Po). Some of the uses of metalloids are :

• Boron: used as an insecticide and in fire retardants.
• Silicon: Silicon gel is applied to burn patients to absorb moisture. Silicon, being a semiconductor of electricity, is extensively used for the manufacture of transistors in the electronics industry.
• Arsenic: It finds use for medicinal purposes.
• Antimony: Used as an antiparasitic drug.
• Germanium finds application along with silicon in cell phones as a semiconductor.

The difference in physical properties of Metals, Nonmetals, and Metalloids

The difference in Properties of Metals, Nonmetals, and Metalloids

1. State: Metals and metalloids are generally solid at room temperature, whereas nonmetals exist as liquids, gases, or brittle solids. Metalloids are brittle solids that crumble to powder when struck.
2. Luster: Metals are lustrous, i.e., show brightness, whereas nonmetals are non-lustrous. Metalloids exhibit metallic luster and may look like metals.
3. Nature: Most metals are malleable and ductile, except zinc and mercury. Nonmetals are mostly non-malleable and non-ductile. All metalloids are brittle solids; therefore, they are not used for structural purposes. For example, Silicon is a brittle solid, but it is lustrous and acts as a good conductor of electricity under certain conditions.
4. Tensile Strength: Metals have high tensile strength; therefore, they are extensively used for structural purposes. Whereas, nonmetals and metalloids have poor or low tensile strength. However, as an exception, carbon fibers made out of carbon, a nonmetal, have very high tensile strength.

1. Conduction of Heat/Electricity: Metals are good conductors of heat and electricity, whereas nonmetals are non or poor conductors. Metalloids are semiconductors of electricity and show average transmission of heat under certain temperature conditions.
2. Chemical properties: Metals lose or donate valence electrons and form cations, whereas nonmetals gain or accept electrons to form anions. Thus, metals and nonmetals combine through the ionic bond to form a compound. However, nonmetals also share electrons to form a compound through the covalent bond. Chemically, metalloids behave mostly as nonmetals. However, they can combine with metals to form an alloy.

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