The development of the Periodic Table was a crucial step in organizing chemical knowledge. While many scientists contributed to understanding elements, one is primarily credited with its invention due to his systematic approach.
The scientist widely recognized for inventing the Periodic Table is Dmitri Mendeleev. He proposed his periodic table arrangement in 1869.
Mendeleev organized the known elements based on increasing atomic mass and recurring chemical properties. His table was groundbreaking because he intentionally left gaps for elements yet to be discovered, accurately predicting their existence and properties.
Which one of the following is the most fundamental characteristic is an element?
March List-I with List-II and select the correct answer using the code given below the Lists:
List I (Element) | List II (Highest Valency) |
A. Sulfur | 1. Five |
B. Phosphorous | 2. Six |
C. Lead | 3. Two |
D. Silver | 4. Four |
When one strikes a safety match, the first step is
The elements of the groups 3 to 12 are called _______ elements or transition elements.