Q.1.
Upto which element, the Law of Octaves was found applicable?
Q.2.
Which of the following is the outermost shell for elements of period 2 ?
Q.3.
According to Mendeleev periodic law, the elements were arranged in the Periodic table in order of
Q.4.
In Mendeleev 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
Q.5.
On moving from left to right in a period in the Periodic table, the size of atom
Q.6.
Which one of the following elements do not constitute a Doebereiner's triad ?
Q.7.
In the second period of periodic table____________ has the largest size.(excluding noble gases Ne)
Q.8.
How many groups present in modern Periodic table ?
Q.9.
The chemical properties of calcium (Ca) are similar to those of .......................
Q.10.
Noble gases were included in Mendeleev's periodic table in the
Q.11.
According to the periodic Law of elements, the variation in properties of elements is related to their
Q.12.
Newlands could classify elements only upto
Q.13.
An element M is in group 13th of the periodic table, the formula for its oxide is
Q.14.
Which of the following is the correct order of the atomic radii of the elements oxygen, fluorine and nitrogen?
Q.15.
The electronic configuration of an element M isIn modern periodic table, the element M is placed in
Q.16.
What happens to the electropositive character of elements on moving from left to right in a periodic table?
Q.17.
Cl, I if these are the Dobereiner’s triad and the atomic masses of chlorine and the Iodine are 35,5 andrespectively. The atomic mass & the particular element is?
Q.18.
Dobereiner tried to arrange the elements with similar properties into group. So, he called the groups “_______” Octaves
Q.19.
If the distance between two Cl atoms in Cl2molecule is 1.98Å, then the radius of Clatom is ________.
Q.20.
Chemical formula of rust is ________.