International journal of innivative research in techonology
By Khandagale,Vidyanand S.Shinde, Asmita V.
“Investigation of Misconceptions for Valency and Chemical Bonding among High School Students”
Publisher:
3/8
Pp. 539544
2021
Investigation of Misconceptions for Valency and Chemical Bonding among High School Students
Type: Empirical
Data collection method: Test
Number of subjects, range: Large — 31 or more
Grade and age of subjects: 9th-12 grade — 15-18 years, Adult — over 18 years
Valency
- The valency of an element is the number of electron shells of the atom.
- When an atom loses two electrons, it becomes a negative ion and its radius decreases.
- Atoms with two electron shells do not bond with any other atom.
- Molecules of ionic compounds are formed when pair of electrons are shared.
- Chemical Bonding
- When a chemical bond is formed between a metal and a non-metal, it is a metallic bond.
- In ionic compounds, there are free electrons which hold the molecules together.
- When covalent bonds are formed, one atom gains electrons while the other atom loses electrons to complete the octet.
- Atoms forming covalent compounds cannot gain, lose or share their valence electrons.