Posts tagged as periodic table

Differences in the Modern Periodic Table

Main differences between Mendeleev’s Periodic Table and the modern periodic table: In the modern periodic table, the elements are arranged in order of increasing atomic number. (In Mendeleev’s table, they were arranged in order of increasing atomic weight). More elements are in the modern periodic table which have been discovered since Mendeleev’s time. eg. the… Continue Reading →

Elements & the Periodic Table

An element is a substance that cannot be broken down into simpler substances by chemical means. Pure substances can be also compounds. But compounds can be chemically broken down to the elements of which they are made. Elements cannot be broken down into simpler substances. Each element has a symbol and an unique atomic number. (Know the symbols of elements with… Continue Reading →

The first 36 elements of the periodic table

H – Hydrogen He – Helium Li – Lithium Be – Beryllium B – Boron C – Carbon N – Nitrogen O – Oxygen F – Fluorine Ne – Neon Na – Sodium Mg – Magnesium Al – Aluminium Si – Silicon P – Phosphorus S – Sulfur Cl – Chlorine Ar – Argon K – Potassium Ca – Calcium Sc – Scandium Ti – Titanium V – Vanadium Cr – Chromium Mn – Manganese… Continue Reading →

The Periodic Table Groups

A group (also known as a family) is a vertical column in the periodic table of elements. The alkali metals – Group I Very reactive soft metals. Increases in reactivity down the group. They have low densities. They react quickly with oxygen in air and with water. Alkali metals are stored in oil to prevent reactions… Continue Reading →