Name two elements that you would expect to have chemical properties similar to Mg.
What is the basis for your choice?
On the basis of atomic numbers predict to which block the elements with atomic number
9,37, 46 and 64 belongs to?
Using the periodic table, predict the formula of compound formed between an element
X of group 13 an another element Y of group 16.
An element X belongs to 3rd period and group 2 of the periodic table. State
(a) The no. of valence electrons in it (b) The valency.
(b) Whether it is metal or a non metal.
An element has atomic number 19. Where would you expect this element in the periodic
table and why?
How do you appreciate the role of electronic configuration of the atoms of elements in
periodic classification?
Without knowing the electronic configurations of the atoms of elements Mendeleev
still could arrange the elements nearly close to the arrangements in the Modern periodic
table. How can you appreciate this?
Comment on the position of hydrogen in periodic table
Higher Order Thinking Questions
How the positions of elements in the periodic table help you to predict its chemical
properties? Explain with an example.
In period 2, element X is to the right of element Y. Then, find which of the elements have:
(1) Low nuclear charge (2) Low atomic size (3) High ionization energy
(4)High electro negativity
(5)More metallic character.
Multiple choice questions
. Number of elements present in period – 2 of the long form of periodic table
( )
a) 2
b) 8
c) 18
d) 32
Nitrogen (Z = 7)is the element of group V of the periodic table. Which of the following is the
atomic number of the next element in the same group? ( )
a) 9
b) 14
c) 15
d) 17
Electron configuration of an atom is 2, 8, 7. To which of the following elements would it be
chemically similar?
( )
a) nitrogen(Z=7)
b) fluorine(z=9)
c) phosphorous(z=15)
d) argon(z=19