1. Mendeléev took 63 cards and on each card he wrote down the properties of one element. 2. He sorted out the elements with similar properties and pinned the cards together on a wall.
1. Mendeléev took 63 cards and on each card he wrote down the properties of one element.
2. He sorted out the elements with similar properties and pinned the cards together on a wall.
1. Only applicable till Calcium. 2. We can fill only 56 elements in this table. These is no place to fit rest elements. 3. In order to fit elements into his Table, Newlands adjusted two elements in the same slot, but also put some unlike elements under the same slot. 4. Cobalt and nickel are in theRead more
1. Only applicable till Calcium.
2. We can fill only 56 elements in this table. These is no place to fit rest elements.
3. In order to fit elements into his Table, Newlands adjusted two elements in the same slot, but also put some unlike elements under the same slot.
4. Cobalt and nickel are in the same slot and these are placed in the same column as fluorine, chlorine and bromine which have very different properties than these elements.
5. Iron, which resembles cobalt and nickel in properties, has been placed far away from these elements.
6. With the discovery of noble gases, the Law of Octaves became irrelevant.
7. Newlands’ Law of Octaves worked well with lighter elements only.
Name the elements that separated the metals and non-metals in periodic table.
Yes it is metaloids
Yes it is metaloids
See lessFill in the blanks: Group 18 elements are called ______________
Noble gas or inert gas. Because these are non-reactive gases.
Noble gas or inert gas.
See lessBecause these are non-reactive gases.
Fill in the blanks: The basis of modern Periodic table is _______________
Based on atomic numbers
Based on atomic numbers
See lessFill in the blanks: Group 17 elements are called ______________
Halogen
Halogen
See lessWhy do you think the noble gases are placed in a separate group?
Noble gases are inert by nature.
Noble gases are inert by nature.
See lessWhat were the criteria used by Mendeleev in creating his Periodic Table?
1. Mendeléev took 63 cards and on each card he wrote down the properties of one element. 2. He sorted out the elements with similar properties and pinned the cards together on a wall.
1. Mendeléev took 63 cards and on each card he wrote down the properties of one element.
See less2. He sorted out the elements with similar properties and pinned the cards together on a wall.
Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (any two)
Scandium and Germanium is correct answers as per NCERT Book.
Scandium and Germanium is correct answers as per NCERT Book.
See lessUse Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements: K, C, AI, Si, Ba.
K2O CO2 Al2O3 SiO2 BaO
K2O
See lessCO2
Al2O3
SiO2
BaO
What were the limitations of Newlands’ Law of Octaves?
1. Only applicable till Calcium. 2. We can fill only 56 elements in this table. These is no place to fit rest elements. 3. In order to fit elements into his Table, Newlands adjusted two elements in the same slot, but also put some unlike elements under the same slot. 4. Cobalt and nickel are in theRead more
1. Only applicable till Calcium.
See less2. We can fill only 56 elements in this table. These is no place to fit rest elements.
3. In order to fit elements into his Table, Newlands adjusted two elements in the same slot, but also put some unlike elements under the same slot.
4. Cobalt and nickel are in the same slot and these are placed in the same column as fluorine, chlorine and bromine which have very different properties than these elements.
5. Iron, which resembles cobalt and nickel in properties, has been placed far away from these elements.
6. With the discovery of noble gases, the Law of Octaves became irrelevant.
7. Newlands’ Law of Octaves worked well with lighter elements only.
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
Yes two triads.
Yes two triads.
See less