If you are given an element which is a inert gas i.e. it has valency 0. Then tell what will be the valency
of the element that comes before it and after it respectively?(ALL QUESTIONS ARE BASED ON THE
PROPERTY OF ELEMENTS WITH ATOMIC NUMBER 1-20 ONLY)
If you are given an element whoose valency is 4 then tell what will the valency of the element which is
at 3rd position after it? (Take the given element as 0 and then count)
An element has 2 electrons in its K orbit(1st Orbit) and the element which is at 2nd position after it
(same condition as in previous question) has 1 electron in is last orbit. Name the given
element and tell its electronic configuration.
Which three elements are ISOBARS(ELEMENTS HAVING SAME MASS NUMBER BUT DIFFERENT
ATOMIC NUMBER) in the list (Atomic Number 1- 20).
Which of the following valency pattern is right for elements under ATOMIC NUMBER 1-20?
a> 1, 0, 1, 2, 3, 4, 3, 2, 1, 0, 1, 2, 3, 4, 3/5, 2, 1, 0, 1, 2
b> 1, 0, 2, 3, 2, 3, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 2, 1, 3, 1, 2
c> 1, 2, 3, 4, 3, 0, 1, 2, 3, 0, 0, 2, 1, 0, 2, 3, 0, 1, 2, 0
d> THERE IS NO SPECIFIC PATTERN
Following are the two options listing the name of elemets in ascending order according to their
Atomic Number.
A> H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca
B> H, He, Li, B, Be, C, N, O, F, Mg, Al, Ne, Na, Si, P, S, Cl, Ar, K, Ca
WHICH IS THE RIGHT ONE?