Mizoram Board Solutions for Chapter: Periodic Classification of Elements, Exercise 4: EXERCISES

Which element has:
The electronic configuration $2, 8, 2$?

Which element has:
A total of three shells, with four electrons in its valence shell?

Which element has:
A total of two shells, with three electrons in its valence shell?

Which element has:
Twice as many electrons in its second shell as in its first shell?

What property do all elements in the same column of the Periodic Table as fluorine have in common?

An atom has an electronic configuration $2, 8, 7.$
To which of the following elements would it be chemically similar?
(Atomic numbers are given in parentheses.)
$\mathrm{N}\left(7\right) \mathrm{F}\left(9\right) \mathrm{P}\left(15\right) \mathrm{Ar}\left(18\right)$

In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12,19,21, and 38. Which of these have physical and chemical properties resembling calcium?

Compare and contrast the arrangement of elements in Mendeleev's Periodic Table and the Modern Periodic Table.