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प्रश्न
State the property trends in general of elements on moving down in a group of the periodic table.
उत्तर
Trends in a group:
- Number of shells and valence electrons: As we move down in a group the number of shells increase and valence electrons in a group remains the same.
- Valency: Valency of all elements is the same.
- Properties of elements:
(a) Metallic character increases,
(b) Non-metallic character decreases - Atomic size increases.
`"F>Cl>Br>I"/"Reactivity decreases"`
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संबंधित प्रश्न
Two elements ‘P’ and ‘Q’ belong to the same period of the modern periodic table and are in Group 1 and Group 2, respectively. Compare their following characteristics in tabular form:-
(a) The number of electrons in their atoms
(b) The sizes of their atoms
(c) Their metallic character
(d) Their tendencies to lose electrons
(e) The formula of their oxides
(f) The formula of their chlorides
Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic number.
Use the letters only written in the Periodic Table given below to answer the questions that Follow :
1) State the number of valence electrons in atom J.
2) Which element shown forms ions with a single negative charge?
3)Which metallic element is more reactive than R?
4) Which element has its electrons arranged in four shells?
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?
In each of the following pair, choose the atom having the bigger size:
Na (At. No. 11) or K (At. No. 19)
Correct the statements.
Elements in the same periods have equal valency.
State the number of elements in periods 1, Periods 2, and Period 3 of the periodic table. Name them.
Choose the most appropriate answer from the following list of oxides which fit the description.
A basic oxide.
An element A has 2 electrons in its fourth shell. State:
position in the periodic table
