Answer : The properties of noble gases which usually occurs in Group 8 A periodic table are described below;
i) They have an outer electrons configuration as [tex] ns^{2} np^{6} [/tex]
ii) Some elements like Ne and Ar does not form a stable chemical compounds.
iii) They have a large ionization energy, He has the largest ionization energy amongst the group.
The properties of noble gases are listed as follows:
1. These have outer electronic configuration of [tex]n{s^2}n{p^6}[/tex] , except Helium.
2. These are monoatomic under standard conditions.
3. These have high ionization energies.
4. These are the least reactive elements in the periodic table.
5. These have low melting and boiling points.
Further Explanation:
Periodic table:
A systematic arrangement of elements in various rows and columns is known as a periodic table. Here, elements are arranged in increasing order of their respective atomic numbers so that elements with the same chemical and physical properties lie in same group. Horizontal rows are called periods and vertical columns are called groups. There are 18 groups and 7 periods in a periodic table.
Elements are further classified as metals, non-metals and metalloids in the periodic table. The elements placed at the left side of the table are called metals and the elements placed at the right of the table are called non-metals. Metalloids are the elements kept between metals and non-metals.
Elements of group 8A of the periodic table are known as noble gases. These are also known as rare or inert gases. Noble gases are present at the rightmost corner of the periodic table. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn) are the noble gases present in group 8A.
The general outermost electronic configuration of noble gases is[tex]n{s^2}n{p^6}[/tex] , except helium whose electronic configuration is [tex]1{s^2}[/tex] . These have completely filled valence shells in these elements and therefore they have a total of 8 valence electrons in their outermost shells, except for helium.
Due to the presence of filled valence shells, these have no tendency to react with other elements and thus called inert gases. These are the least reactive elements present in the periodic table
The noble gases have complete valence shells so these do not lose electrons and thereby possess very high ionization energies. Helium has the highest ionization energy among all the noble gases.
Because of their low reactivities, noble gases exist as monoatomic gases under standard conditions. These have weak interatomic forces and therefore have very low melting and boiling points.
Learn more:
1. Which ion was formed by providing the second ionization energy? https://brainly.com/question/1398705
2. Write a chemical equation representing the first ionization energy for lithium: https://brainly.com/question/5880605
Answer details:
Grade: High School
Subject: Chemistry
Chapter: Periodic classification of elements
Keywords: noble gases, ns2np6, He, Ne, Ar, Kr, Xe, Rn, helium, neon, argon, krypton, xenon, periodic table, elements, groups, periods, 8A, high ionization energy, least reactive, low melting and boiling points.
