Question

To keep them from reacting, some highly reactive elements are stored in

Answer 1

Some highly reactive elements are stored in Argon

Further explanation

The periodic system of elements is an arrangement of elements classified based on similar properties and their atomic number order.

The periodic system is divided into groups (vertical order) and periods (horizontal order)

In one group, from top to bottom, the first ionization of energy tends to get smaller, because the addition of electron shells makes the attraction of the atomic nucleus to the outer electrons (valence electron) weaker, so that it is easily released, forming cations +

For example: Group 1A elements

If we look at the atomic number of elements in group 1A:

• H: 1

• Li: 3

• Na: 11

• K: 19

• Rb: 37

• Cs: 55

• and Fr: 87

Shows that, the element is getting down, the shell electron is increasing, so that in one group, from top to bottom, the radius of the atom tends to get bigger, according to the electron shell increase.

From top to bottom, the easier the elements release electrons, and the more reactive

For this reason, IA elements (also called alkali metal elements) are highly reactive metals.

This reactivity causes a very large reaction to water and water

So that from group 1A Lithium is less reactive, and Na is more reactive

We complete the available answer choices

To keep them from reacting, some highly reactive elements are stored in

A. water.

B. pure oxygen.

C. liquid mercury.

D. argon.

Let's finish each answer choice

• A. water.

Alkali metals react with water to form hydroxides and H₂ gas.

Reaction that happens

2L (s) + H₂O (l) -> 2LOH (aq) + H₂ (g)

So storage with water will cause a reaction

• B. pure oxygen.

Alkali metals react with oxygen to form oxides, peroxides and superoxides.

• oxides (O²⁻)

4L (s) + O₂ (g) -> 2L₂O (s)

Example Na₂O, K₂O

• peroxide (O₂²⁻)

2L (s) + O₂ (g) -> M₂O₂ (s)

Examples of Na₂O₂, K₂O₂

• superoxide (O²⁻)

L (s) + O₂ (g) -> LO₂ (s)

Example: NaO₂, KO₂

• C. liquid mercury.

Alkali metal will dissolve in mercury to form amalgam ( filling material used in dentistry )

Example: Na₃Hg

• D. argon.

Argon is a precious metal that has stability so it is difficult to react with other elements, including alkali

Learn more

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Keywords: element, group 1A, highly reactive elements, argon