Advertisements
Advertisements
प्रश्न
Write an explanation.
Group
Advertisements
उत्तर
- Vertical columns are indeed called groups, and there are exactly 18 vertical columns in the Modern Periodic Table.
- This is the fundamental reason for chemical similarity. Elements in the same group share the same number of valence electrons (e.g., Group 1 elements have 1 valence electron, and Group 17 elements have 7), leading to highly similar chemical behaviours.
- As you move down a group, new electron shells are added. This increases the atomic size. Consequently, outer electrons are lost more easily, which causes the metallic character (electropositivity) to increase down the group.
- Group 1 elements (Lithium, Sodium, Potassium, etc.) are officially classified as alkali metals, and Group 17 elements (Fluorine, Chlorine, Bromine, etc.) are halogens.
- Knowing an element's group lets you immediately predict its valency, typical oxidation states, and how it will bond with other elements.
APPEARS IN
संबंधित प्रश्न
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
3Li, 14Si, 2He, 11Na, 15P Which of these elements belong to be period 3?
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
1H, 7N, 20Ca, 16S, 4Be, 18Ar Which of these elements belong to the second group?
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
11Na, 15P, 17Cl, 14Si, 12Mg Which of these has largest atoms?
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with an explanation.
13Al, 14Si, 11Na, 12Mg, 16S
Which of the above elements has the highest metallic character?
An element has its electron configuration as 2, 8, 2. Now answer the following question.
What is the atomic number of this element?
An element has its electron configuration as 2, 8, 2. Now answer the following question.
To which period does this element belong?
An element has its electron configuration as 2, 8, 2. Now answer the following question.
Which of the following elements would this element resemble?
(Atomic numbers are given in the brackets)
N(7), Be(4), Ar(18), Cl(17)
______ is the outermost shell for elements of period 2.
Which among the following elements would lose an electron easily?
Which among the following is the largest element?
Write the name.
The group of elements having electronic configuration 2, 2.
Right or wrong sentence.
The valency of the elements in group 2 is 1.
Right or wrong sentence.
The elements lithium and beryllium are in the same period because their valencies are similar.
Beryllium and calcium are alkaline earth metals.
Write a scientific reason.
Boron and oxygen elements are placed in the second period in periodic table.
Write a scientific reason.
In group 2, beryllium and calcium elements, calcium is more electropositive element than beryllium.
Complete the following chart.
| Shell | n | 2n2 | Electron holding capacity |
| K | 2 × 12 | 2 | |
| L | 2 | 8 | |
| 3 | 2 × 32 | 18 | |
| N | 4 | 2 × 42 |
Observe the given chart and answer the questions given below.
| Element | A | B | C | D |
| Electronic configuration | 2, 1 | 2, 8 | 2, 8, 1 | 2, 8, 8 |
- Which elements are in the same row?
- Which elements have the same column?
- Which elements are in the 18th column?
- Which element is more reactive among A and C?
- Which of the following elements A or B will form compounds?
