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.
4Be, 6C, 8O, 5B, 13Al Which is the most electropositive element among these?
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
6C, 3Li, 9F, 7N, 8O Which of the above elements has the highest nonmetallic character?
Write the scientific reason.
The third period contains only eight elements even though the electron capacity of the third shell is 18
An element has its electron configuration as 2,8,2. Now answer the following questions.
i. What is the atomic number of this element?
ii. What is the valency of this element?
iii. What is the group of this element?
iv. To which period does this element belong?
v. With which of the following elements would this element resemble?
`_7N , _4Be , _18Ar , _17CL`
An element has its electron configuration as 2, 8, 2. Now answer the following question.
To which period does this element belong?
Which among the following elements would lose an electron easily?
Find the odd one out and give its explanation.
Answer the following question in one sentence.
Write the name of an element having electronic configuration 2,8,2.
The number of electrons in the outermost shell of an atom determines the ______.
Write the name.
The element having stable electron configuration from the third period.
Write the name.
Highest electropositive element
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.
Right or wrong sentence.
The number of shields decreases as the calculation goes down from top to bottom.
Write a scientific reason.
Boron and oxygen elements are placed in the second period in periodic table.
Find the period in which these elements can be placed.
4Be, 17Cl, 2He, 13Al
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?
XY compound is formed by X (Atomic number 11) and Y (Atomic number 17), then answer the questions given below.
- Determine the position of the element X and Y periodic table.
- Which type of elements X and Y are metals, nonmetals or metalloids?
- From which block the elements X and Y are?
- Determine the electronic configuration and valency of these elements.
Observe the periodic table given below and write the answers of the questions.
- Write the name and valencies of the elements in 3rd row.
- Classify the elements in this row as metal, nonmetal and metalloids.
- Which block does nonmetals belong to?
- Write name of any two metalloid elements.
