Periodic Table Questions ICSE class 9

(Q.1)  The element having largest atomic size in second period is

(Q.2)  The atom of an element has three shells. There are four electrons in its valence shell. The element is

(Q.3)  Dobereiner’s classified elements in group of 3 called as Triads. The elements of one of the Dobernier's Triad are

(Q.4)  In Newland’s Octaves, properties of the first element is similar to those of the____________element

(Q.5)  Newlands’ Law of Octaves is applicable only upto

Q.6)  Mendeleev arranged the elements on the basis of_______________

(Q.7)  Eka aluminium is now known as

(Q.8)  Whenwe move from Li to Rb Number of shells   __________________.

(Q.9)  Oxides of elements of group 1 are ___________in nature.

(Q.10)  How many elements were known when Mendeleev started his work?

(Q.12)  In an atom electrons are arranged in shells. These shellsare represented by the symbols:

(Q.13)  Why are anions bigger than their parent atoms?

(Q.14)  An atom has electronic configuration 2, 8, 7:-  What is the number of valence electrons  and valency of this element?
(Q.15)  Mention the type of bonds formed between elements of group 1 and group 17?