Advertisements
Advertisements
प्रश्न
Write down the outermost electronic configuration of alkali metals. How will you justify their placement in group 1 of the periodic table?
उत्तर
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
संबंधित प्रश्न
Use the periodic table to answer the following question.
Identify an element that would tend to lose two electrons.
Assign the position of the element having an outer electronic configuration in the periodic table.
ns2 np4 for n = 3
Write the outer electronic configuration of the following using the orbital notation method. Justify.
Ge (belongs to period 4 and group 14)
Write the outer electronic configuration of the following using the orbital notation method. Justify.
Po (belongs to period 6 and group 16)
Write the outer electronic configuration of the following using the orbital notation method. Justify.
Cu (belongs to period 4 and group 11)
Consider the oxides Li2O, CO2, B2O3.
Which oxide would be the most acidic?
In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, s, p, d and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Arfbau principle, the seven periods have 2, 8, 8, 18, 18, 32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.
The electronic configuration of the element which is just above the element with atomic number 43 in the same group is ______.
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 ______.
