the notes of periodic table of classification
Answers
Science Class 10 Notes for Periodic Classification of Elements
1. Classification means identifying similar species and grouping them together.
2. Lavoisier divided elements into two main types known as metals and non-metals.
3. Doberiner’s Law of Triads:
According to this law, “in certain triads (grout) of three elements) the atomic mass of the central element was the arithmetic mean of the atomic masses of the other two elements.” But in some triads all the threc elements possessed nearly the same atomic masses, therefore the law was rejected
Answer:
Classification,Lavoisier, Doberiner's law of Triads, New land's law of octaves,Mendeleev’s Periodic Table,Modern Periodic Law,Modern Periodic Table,Trends in Modern Periodic Table,
Explanation:
10 Notes for Periodic Classification of Elements
1. Classification means identifying similar species and grouping them together.
2. Lavoisier divided elements into two main types known as metals and non-metals.
3. Doberiner’s Law of Triads:
According to this law, “in certain triads (grout) of three elements) the atomic mass of the central element was the arithmetic mean of the atomic masses of the other two elements.” But in some triads all the threc elements possessed nearly the same atomic masses, therefore the law was rejected.
4. Newland’s Law of Octaves:
According to this law “the elements are arranged in such a way that the eighth element starting from a given one has properties which are a repetition of those of the first if arranged in order of increasing atomic weight like the. eight note of musical scale."
5. Mendeleev’s Periodic Table:
Mendeleev arranged 63 elements known at that time in the periodic table. According to Mendeleev “the properties of the elements are a periodic function of their atomic masses.” The table consists of eight vertical column called ‘groups’ and horizontal rows called ‘periods’.
6. Modern Periodic Law : This law was given by Henry Moseley in 1913. it states, “Properties of the elements are the periodic function of their atomic numbers”.
7. Modern Periodic Table
Moseley proposed this modern periodic table and according to which “the physical and chemical properties of elements are periodic function of their atomic number and not the horizontal rows called “periods”. The groups have been numbered 1, 2, 3 …. 18 from left to right.
8. Trends in Modern Periodic Table : The trends observed in some important properties of the elements in moving down the group (from top to bottom of the table) and across a period (from left to right in a period)