Advertisements
Advertisements
Question
Write down the outermost electronic configuration of alkali metals. How will you justify their placement in group 1 of the periodic table?
Advertisements
Solution
The group 1 elements are called alkali metals which possess outermost electronic configuration as ns1.All the elements that have same outermost electron configuration possess similar properties and are placed in the same group.
| Atomic Number | Symbol | Electronic Configuration |
| 3 | \[\ce{Li}\] | 1s22s1 (or) \[\ce{[He]}\] 2s1 |
| 11 | \[\ce{Na}\] | 1s22s22p63s2 (or) \[\ce{[Ne]}\] 3s1 |
| 19 | \[\ce{K}\] | 1s22s22p63s24s1 (or) \[\ce{[Ar]}\] 4s1 |
| 37 | \[\ce{Rb}\] | 1s22s22p63s23d104s2sp65s1 (or) \[\ce{[Kr]}\] 5s1 |
|
55 |
\[\ce{Cs}\] \[\ce{Fr}\] |
1s22s22p63s23p63d104s24p65d105s25p66s1 (or) \[\ce{[Xe]}\] 6s1 \[\ce{[Rn]}\] 7s1 |
APPEARS IN
RELATED QUESTIONS
Write the atomic number of the element present in the third period and a seventeenth group of the periodic table.
Use the periodic table to answer the following question.
Identify an element with five electrons in the outer subshell.
Use the periodic table to answer the following question.
Identify an element that would tend to gain two electrons.
Assign the position of the element having an outer electronic configuration in the periodic table.
ns2 np4 for n = 3
Assign the position of the element having an outer electronic configuration in the periodic table.
(n - 2) f7 (n - 1)d1 ns2 for n = 6
Write the outer electronic configuration of the following using the orbital notation method. Justify.
Ge (belongs to period 4 and group 14)
Answer the following.
La belongs to group 3 while Hg belongs to group 12 and both belong to period 6 of the periodic table. Write down the general outer electronic configuration of the ten elements from La to Hg together using the orbital notation method.
Answer the following question.
For s-block and p-block elements show that the number of valence electrons is equal to its group number.
Consider the oxides Li2O, CO2, B2O3.
Which oxide would you expect to be the most basic?
Consider the oxides Li2O, CO2, B2O3.
Give the formula of an amphoteric oxide.
An element belongs to 3rd period and group-13 of the periodic table. Which of the following properties will be shown by the element?
(i) Good conductor of electricity
(ii) Liquid, metallic
(iii) Solid, metallic
(iv) Solid, non metallic
Identify the group and valency of the element having atomic number 119. Also predict the outermost electronic configuration and write the general formula of its oxide.
How would you explain the fact that first ionisation enthalpy of sodium is lower than that of magnesium but its second ionisation enthalpy is higher than that of magnesium?
How does the metallic and non-metallic character vary on moving from left to right in a period?
The electronic configuration of Pt (atomic number 78) is ______.
E.N. of Si is ______. (Covalent radius of Si = 1.175 Å)
\[\ce{_92U^235}\] is a member of VI B group. The new element formed by the emission of α-particle will be a member of ______ group.
