History
Newlands relation is called
Law of octaves
The basis for the modern periodic table is ______.
Atomic number
Name the scientist who prepared the modern periodic table.
Bohr
Metallic character ……… down the group.
increases
An element X belongs to group 2 and another element Y belongs to group 15 of the periodic table: What is the number of valence electrons in X?
2
Mendeleev’s basis for the Periodic Table is
atomic mass
Non-metals are located on the ……… side of the Periodic Table.
right
why did Newland compare his method with a characteristic of musical scale?
This classification of elements is compared with a characteristic of musical scale because in this classification, the repetition in the properties of elements is just like the repetition of eighth note in an octave of music.
Atomic size ……… along the period.
decreases
What is the valency of X?
2
Upto which element, the Law of Octaves was found applicable?
Calcium
Halogens belong to group ……… of the Periodic Table
17
At the time of Mendeleev, the number of elements known was
63
Electronegative character ……… down the group.
decreases
What the number of valence electrons in Y?
What names were given by Mendeleev to the then undiscovered element scandium
Eka boron
What is the atomic number of elements of period 3 n group 17 of the Periodic Table?
17
Name the element which has taken the place of eka-silicon
Germanium
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
decrease
What is the valency of Y?
3
The properties of eka-aluminium predicted by Mendeleev are the same as the properties of later discovered element:
gallium
Name the neutral atom in the Periodic Table which has the same number of electrons as K+ and Cl-.
Argon
Which group of elements was missing from Mendeleev's original periodic table
Noble gasses
Ongoing down in a group of the periodic table, the number of valence electrons increases. true or false?
false
What is valency based on?
The number of electrons lost or gained by one atom of an element to achieve the nearest inert gas configuration gives us the valency