Biology X | LIFE PROCESSES | WHAT ARE LIFE PROCESSES?
WHAT ARE LIFE PROCESSES? The maintenance functions of living organisms must go on even when they are not doing anything…
Biology X | CHAPTER – 6 | LIFE PROCESSES
CHAPTER – 6 LIFE PROCESSES How do we tell the difference between what is alive and what is not alive?…
Chemistry X | Periodic Classification of Elements | Trends in the Modern Periodic Table
Trends in the Modern Periodic Table Valency : As you know, the valency of an element is determined by the…
Chemistry X | Periodic Classification of Elements | Position of Elements in the Modern Periodic Table
Position of Elements in the Modern Periodic Table The Modern Periodic Table has 18 vertical columns known as ‘groups’ and…
Chemistry X | Periodic Classification of Elements | THE MODERN PERIODIC TABLE
THE MODERN PERIODIC TABLE In 1913, Henry Moseley showed that the atomic number of an element is a more fundamental…
Chemistry X | Periodic Classification of Elements | Limitations of Mendeléev’s Classification
Limitations of Mendeléev’s Classification Electronic configuration of hydrogen resembles that of alkali metals. Like alkali metals, hydrogen combines with halogens,…
Chemistry X | Periodic Classification of Elements | Achievements of Mendeléev’s Periodic Table
Achievements of Mendeléev’s Periodic Table While developing the Periodic Table, there were a few instances where Mendeleev had to place…
Chemistry X | Periodic Classification of Elements | MENDELEEV’S PERIODIC TABLE
MENDELEEV’S PERIODIC TABLE Even after the rejection of Newlands’ Law of Octaves, many scientists continued to search for a pattern…
Chemistry X | Periodic Classification of Elements | Newlands’ Law of Octaves
Newlands’ Law of Octaves The attempts of Döbereiner encouraged other chemists to correlate the properties of elements with their atomic…
Chemistry X | Periodic Classification of Elements | Döbereiner’s Triads
Döbereiner’s Triads In the year 1817, Johann Wolfgang Döbereiner, a German chemist, tried to arrange the elements with similar properties…