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Question
The electronic configuration of an element is 2, 8, 4. State it:
group and period in the Modern Periodic Table.
Solution
The electronic configuration of the given element is 2,8,4. Since the number of valence electrons for the given element is 4. Hence, the element belongs to group 14 (10 + 4) and the 3rd period.
RELATED QUESTIONS
Write the electronic configuration of K and Ne.
Two elements ‘P’ and ‘Q’ belong to the same period of the modern periodic table and are in Group 1 and Group 2, respectively. Compare their following characteristics in tabular form:-
(a) The number of electrons in their atoms
(b) The sizes of their atoms
(c) Their metallic character
(d) Their tendencies to lose electrons
(e) The formula of their oxides
(f) The formula of their chlorides
Given below are some elements of the modern periodic table. Atomic number of the element is given in parentheses.
A(4), B(9), C(14), D(19), E(20)
(a) Select the element that has one electron in the outermost shell. Also, write the electronic configuration of this element.
(b) Which two elements amongst these belong to the same group? Give reasons for your answer.
(c) Which two elements amongst these belong to the same period? Which one of the two has bigger atomic radius?
How does the number of valence electrons vary on moving from left or right in the first period of the periodic table?
State one reason for keeping fluorine and chlorine in the same of the periodic table.
An element A has atomic number 14. To which period does this element belong and how many elements are there in this period.
What is modern periodic law?
The following questions refer to the Periodic Table.
Name the first and last element in period 2.
The position of elements A, B, C, D and E in the periodic table are shown below:
|
Group 1 |
Group 2 |
Group 17 |
Group 18 |
|
|
|
|
D |
|
|
B |
C |
|
|
A |
|
|
E |
State which is metals, non-metals, and noble gas in this table.
Element P has atomic number 19. To which group and period, does P belong? Is it a metal or a non-metal? Why?
