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प्रश्न
Write an explanation.
Group
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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.
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संबंधित प्रश्न
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?
Which of this element belong to the period 3? Write their electronic configuration
`3^(Li) , 14^(Si) , 2^(He) , 15^(P)`
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 is the largest element?
Find the odd one out and give its explanation.
Answer the following question in one sentence.
What determines the chemical reactivity of elements?
Match the columns.
| Column A | Column B |
| 1) s -block | a) Lanthanides and actinides |
| 2) p -block | b) Group 3 to 12 |
| 3) d -block | c) Group 1, 2 |
| 4) f -block | d) Group 13 to 18 |
| e) Zero group |
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 valency of the elements in group 2 is 1.
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.
Distinguish between:
Group - Period
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.
