SS1 First Term Chemistry Lesson Note – Valency; Oxidation Number; Ions and Radicals

The content is just an excerpt from the complete note for SS1 First Term Chemistry Lesson Note – Valency; Oxidation Number; Ions and Radicals. Check below to download the complete DOCUMENT

WEEK: 4

TOPIC: VALENCY, OXIDATION NUMBER, IONS AND RADICALS

CONTENT

1. Valency of elements
2. Oxidation numbers of elements in compounds
3. Ions and radicals

PERIOD 1: VALENCY OF ELEMENTS

VALENCY

The valency of an element is the combining power of the element. It is defined as the number of atoms of hydrogen that will combine with or displace one atom of the element in chemical reactions. Some elements have more than one valency. For example.

First twenty elements with their valences show this character.

Atomic Number	Element	Symbol	Valency
1	Hydrogen	H	1
2	Helium	He	Nil
3	Lithium	Li	2
4	Beryllium	Be	2
5	Boron	B	3
6	Carbon	C	2 or 4
7	Nitrogen	N	3 or 5
8	Oxygen	O	2
9	Fluorine	F	1
10	Neon	Ne	Nil
11	Sodium	Na	1

To gain full access to the note: DOWNLOAD FILE