
Which of the following has zero valency
A. Sodium
B. Beryllium
C. Aluminium
D. Krypton
Answer
163.2k+ views
Hint: The combining capability of an atom is its valency. It expresses the no.of bonds that an atom can constitute as part of a compound. Valence electrons exist in the outer orbit of the atom.
Complete Step by Step Solution:
In this question, we have to find out which of the following elements have zero valencies.
We know that valency is the tendency of an atom to combine with another atom. An element that has zero valency does not combine with other atoms or does not form compounds.
Krypton is the element of Group 18 of the modern periodic table. All the members of this family have gaseous forms and are known as noble gases. They exhibit low chemical reactivity as they maintain stable electron configurations. They have a stable octet. Due to this, they do not constitute molecules readily and largely exist as monatomic gases.
The valence shell of Krypton is filled i.e. form an octet. These gases exhibit inactive behaviour. In the bond formation, they neither gain nor lose an electron so they don't take part in the bond formation. Hence, the valency of group 18 is deemed as 0. So, Krypton has zero valencies.
So, option D is correct.
Note: If the outermost shell carries 8 electrons then the element has a complete octet. Elements earn, share, or lose the electrons the atoms achieve a stable octet. The ability of an atom is depicted by the entire number of electrons eliminated, earned, or shared to complete its octet which also specifies the valency of the atom.
Complete Step by Step Solution:
In this question, we have to find out which of the following elements have zero valencies.
We know that valency is the tendency of an atom to combine with another atom. An element that has zero valency does not combine with other atoms or does not form compounds.
Krypton is the element of Group 18 of the modern periodic table. All the members of this family have gaseous forms and are known as noble gases. They exhibit low chemical reactivity as they maintain stable electron configurations. They have a stable octet. Due to this, they do not constitute molecules readily and largely exist as monatomic gases.
The valence shell of Krypton is filled i.e. form an octet. These gases exhibit inactive behaviour. In the bond formation, they neither gain nor lose an electron so they don't take part in the bond formation. Hence, the valency of group 18 is deemed as 0. So, Krypton has zero valencies.
So, option D is correct.
Note: If the outermost shell carries 8 electrons then the element has a complete octet. Elements earn, share, or lose the electrons the atoms achieve a stable octet. The ability of an atom is depicted by the entire number of electrons eliminated, earned, or shared to complete its octet which also specifies the valency of the atom.
Recently Updated Pages
JEE Main 2021 July 25 Shift 1 Question Paper with Answer Key

JEE Main 2021 July 22 Shift 2 Question Paper with Answer Key

JEE Main 2025 Session 2: Exam Date, Admit Card, Syllabus, & More

JEE Atomic Structure and Chemical Bonding important Concepts and Tips

JEE Amino Acids and Peptides Important Concepts and Tips for Exam Preparation

JEE Electricity and Magnetism Important Concepts and Tips for Exam Preparation

Trending doubts
Types of Solutions

Degree of Dissociation and Its Formula With Solved Example for JEE

Classification of Drugs

Instantaneous Velocity - Formula based Examples for JEE

JEE Main Chemistry Question Paper with Answer Keys and Solutions

JEE Main Chemistry Online Mock Test for Class 12

Other Pages
Haloalkanes and Haloarenes

Alcohol Phenol and Ether Class 12 Notes: CBSE Chemistry Chapter 7

Coordination Compounds Class 12 Notes: CBSE Chemistry Chapter 5

NCERT Solutions for Class 12 Chemistry In Hindi Chapter 10 Haloalkanes and Haloarenes In Hindi Mediem

Total MBBS Seats in India 2025: Government College Seat Matrix

NEET Total Marks 2025: Important Information and Key Updates
