How does the valency of elements vary in going down a group of the periodic table?

Academic Chemistry NCERT Class 10

All the elements in a group have the same valency while going down the group.

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Updated on: 10-Oct-2022

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(a) How does the chemical reactivity of alkali metals vary on going down in group 1 of the periodic table?(b) How does the chemical reactivity of the halogens vary on going down in group 17 of the periodic table?
(a) How does the electropositive character of elements change on going down in a group of the periodic table?(b) State how the valency of elements varies (i) in a group, and (ii) in a period, of the periodic table.
(a) What is the usual number of valence electrons and valency of group 18 elements of the periodic table?(b) What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
List the valency of the first 30 elements of the periodic table.
(a) How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way?(b) What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?
(a) How does the atomic size vary on going down from top to bottom in a group of the periodic table? Why does it vary this way?(b) Lithium, sodium and potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements? Explain your answer.
State whether the following statement is true or false:On-going down in a group of the periodic table, the number of valence electrons increases.
What happens to the metallic character of the elements as we go down in a group of the periodic table?
How does the valency of elements change on moving from left to right in the third period of the periodic table?
(a) How does the tendency to lose electrons change as we go down in group 1 of the periodic table? Why does it change this way?(b) How does the tendency to gain electrons change as we go down in group 17 of the periodic table? Why does it change this way?
How does the number of valence electrons vary on moving from left to right:(i) In the first period of the periodic table? (ii) In the second period of the periodic table?
How Many Elements Does Periodic Table Have??
Carbon, Group (14) element in the Periodic Table, is known to form compounds with many elements. Write an example of a compound formed with(a) chlorine (Group 17 of Periodic Table)(b) oxygen (Group 16 of Periodic Table)
Atomic number of a few elements are given below 10, 20, 7, 14(a) Identify the elements(b) Identify the Group number of these elements in the Periodic Table(c) Identify the Periods of these elements in the Periodic Table(d) What would be the electronic configuration for each of these elements?(e) Determine the valency of these elements.
Fill in the blanks in the following statements:(a) The horizontal rows in a periodic table are called ............... (b) In going across a period (right to left) in periodic table, the atomicExplain with the diagram:(a.) If the angle between the applied force and the displacement caused due to the force is 0°, then the displacement is in the same direction of the applied force.(b.)If the angle between the applied forc size of the atom ...............(c) On moving form right to left in the second period, the number of valency electrons ...............(d) On going down in a group in the periodic table, the metallic character of elements ...............(e) The tendency to gain an electron ............... on moving down in a group of the periodic table.

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