Dobereiner and Newland
The concept of grouping elements into triads was given by
Dobereiner
Sate the Mendeleev Periodic law
The properties of the elements are periodic functions of their atomic masses.
An atom of an element has the electronic configuration 2,8,2. To which group does it belong?
2nd group
What is the other name for group 18th elements?
Noble gases
What was Newland's law based on?
Musical notes
Which two elements did Mendeleev use to form different compounds?
Oxygen and Hydrogen
An element X from group 2 of the Periodic Table reacts with Y from group 17 to form a compound. Give the formula of the compound.
XY2
Which of the following forms the basis of the modern periodic table?
Atomic Number
How many Triads were given by Dobereiner?
Three Triads were given
At the time of Mendeleev, the number of elements known were
63
A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide?
M2O
Which group elements are called transition metals?
Group number 3 to 12
Up to which element was the Law of Octaves was found applicable?
Calcium
In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the Periodic Table later?
Germanium
Carbon belongs to Period 2 and Group 14. Silicon belongs to Period 3 and Group 14. If the atomic number of carbon is 6, the atomic number of silicon is?
14
State the Modern Periodic Law
Physical and chemical properties or properties of the elements are periodic functions of their atomic numbers.
In What years did Dobereiner and Newland, respectively give their laws?
Dobereiner- 1829
Newland- 1865
The properties of eka-aluminium predicted by Mendeleev are the same as the properties of a later discovered element
Gallium
The elements A, B and C belong to groups 1, 14 and 17 respectively of the Periodic Table. Which two elements will form ionic compounds?
A and C
Isotopes possess (Hint-Same Number of....)
Same number of Protons