4.5 Properties of Substances Based on their Particle Content

4.5 Properties of Substances Based on their Particle Content 1.   Matter is anything that occupies space and has mass. 2.   Matter can be divided into elements and compounds. 4.5.1 Atoms, Molecules and Ions 1.   Substances are made of tiny particles called atoms, molecules and ions. 2.   Atoms are the tiniest particles in an element. 3.  … Read more

4.3.2 Isotopes

4.3.2 Isotopes 1. Isotopes are atoms of certain elements which have the same number of protons but different number of neutrons in the nucleus of the atoms. 2. Isotopes of the same element have same chemical properties. For example, both carbon-12 and carbon-13 burn in oxygen to form carbon dioxide.   3. Physical properties of isotopes are different. … Read more

4.4 Classification of Elements in the Period Table

4.4 Classification of Elements in the Period Table 4.4.1 The classification of Elements 1. In modern periodic table, the elements are arranged in ascending order of proton number. Group 1. The vertical columns of the periodic table is called group. 2. There are 18 groups in the periodic table. 3. Elements in the same group have similar chemical properties. … Read more

4.2 Structure of Atoms

4.2 Structure of Atoms Atoms 1. All matter consists of tiny units called atoms. 2. Atom is a basic unit of all matter. 4.2.1 Subatomic Particles 1. An atom is made up of particles that are even smaller called subatomic particles.  There are three types of subatomic particles, which are  (a)  Protons  (b)  Neutrons  (c)  Electrons Subatomic particles … Read more