Grade 11 Exam > Grade 11 Videos > Crash Course for UAE Grade 11 > Practice questions: Periodic Classification & Chemical Bonding and S-Block Elements (Old NCERT)
Practice questions: Periodic Classification & Chemical Bonding and S-Block Elements (Old NCERT) Video Lecture | Crash Course for UAE Grade 11
FAQs on Practice questions: Periodic Classification & Chemical Bonding and S-Block Elements (Old NCERT) Video Lecture - Crash Course for UAE Grade 11
| 1. What is periodic classification? |  |
Ans. Periodic classification is a system in which the elements are arranged in order of their increasing atomic number and grouped together based on their similarities in properties. This arrangement is known as the periodic table, which is divided into periods (rows) and groups (columns).
| 2. What is chemical bonding? | |
Ans. Chemical bonding refers to the process by which atoms or ions are held together in a chemical compound. It involves the sharing, transferring, or overlapping of electrons between atoms to achieve a stable electronic configuration. The three main types of chemical bonding are ionic bonding, covalent bonding, and metallic bonding.
| 3. What are S-block elements? | |
Ans. S-block elements are the elements in the periodic table that belong to Group 1 (alkali metals) and Group 2 (alkaline earth metals). These elements have their outermost electron(s) in the s orbital. They are highly reactive metals and display similar chemical properties within their respective groups.
| 4. How is the periodic table arranged? | |
Ans. The periodic table is arranged in order of increasing atomic number. The elements are organized into periods (rows) and groups (columns). Each period represents a new energy level or shell, while each group consists of elements with similar properties. The periodic table is further divided into blocks (s, p, d, f) based on the subshells being filled.
| 5. What are the trends observed in the periodic table? | |
Ans. There are several trends observed in the periodic table. Some of the important trends include:
- Atomic radius: Generally decreases across a period and increases down a group.
- Electronegativity: Generally increases across a period and decreases down a group.
- Ionization energy: Generally increases across a period and decreases down a group.
- Metallic character: Generally decreases across a period and increases down a group.
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