Periodic Table – Definition

Definition Group Vertical columns of elements in the periodic table (similar chemical properties). Periods Horizontal rows of elements in the periodic table. Flashcards GROUP Vertical columns of elements in the periodic table. PERIOD Horizontal rows of elements in the periodic table. Soalan Jawapan Soalan Jawapan Soalan Jawapan Soalan Jawapan

The Periods

Period is the horizontal rows of elements in the Periodic Table. The modern periodic table has 7 periods. The period number indicates the number of electron shell. Elements in the same period have same number of electron shells. The proton number of elements increases from left to right crossing the period. The number of electrons … Read more

Group 17 Elements – Halogens

Group 17 elements are typical non-metals and also known as halogens. The elements in this group are fluorine. chlorine, bromine, iodine and astatine. In nature, all halogens exist as diatomic molecules. They are written as F2, Cl2, Br2, I2 and As2. Most of the halogens exist in the nature as halide salts. Halide is the … Read more

Physical Properties of Alkali Metals

Physical Properties of Alkali Metals Name Proton number Electron arrangement Lithium 3 2.1 Sodium 11 2.8.1 Potassium 19 Rubidium 37 Caesium 55 Francium 87 All Group 1 metal exist as solid at room temperature and hence have all the typical metallic properties, such as: good conductors of heat good conductors of … Read more

Group 1 Elements – Alkali Metals

The Group 1 metals is called the Alkali Metals. This is because they form oxides and hydroxides that dissolve in water to give alkaline solutions. As shown in the diagram on the right, elements in this group are lithium, sodium, potassium, rubidium, caesium and francium. They are the first element of a period, with one … Read more

Group 18 Elements – Noble Gases

The “Noble Gases” are the last group in the Periodic Table, they also known as “inert gas”, due to their non-reactive behavior. This group consist of six elements, namely Helium, Neon, Argon, Kripton, Xenon and Radon. They are non-metallic, colourless gases at room temperature and pressure with very low melting points and boiling points. They … Read more

Introduction to Periodic Table

History of Development Johann Dobereiner – Law of Triads Nature contained triads of elements The middle element had properties that were an average of the other two members when ordered by the atomic weight (the Law of Triads). John Newlands – Law of Octaves Any given element will show similar behavior to the eighth element … Read more

SPM Form 4 Chemistry Chapter 4 – Periodic Table

Revision Notes 4.1 The Periodic Table4.2 Group 18 Elements 4.3 Group 1 Elements4.4 Group 17 Elements4.5 The Periods and Transition Metals Videos The Group in Periodic Table The Period in Periodic Table Group 18 Elements Group 1 Metal Reaction of Alkali Metals with Oxygen Gas Group 17 Elements Reactivity of Group 17 Elements