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प्रश्न
Which one of the following does not increase while moving down the group of the periodic table?
पर्याय
Atomic radius
Metallic character
Valency
Number of shells
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उत्तर
Valency
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संबंधित प्रश्न
The elements Be, Mg and Ca each having two electrons in their outermost shells are in periods 2, 3, and 4 respectively of the modern periodic table. Answer the following questions, giving justification in each case:-
(i) Write the group to which these elements belong.
(ii) Name the least reactive element.
(iii) Name the element having largest atomic radius.
An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number, period number and valency of 'X'.
Define the term : Atomic size
Write the number of horizontal rows in the modern periodic table. What are these rows called?
Consider two elements 'A' (Atomic number 17) and 'B' (Atomic number 19) :
(i) Write the positions of these elements in the modern periodic table giving justification.
(ii) Write the formula of the compound formed when 'A' combines with 'B.'
(iii) Draw the electron dot structure of the compound and state the nature of the bond formed between the two elements.
Use the letters only written in the Periodic Table given below to answer the questions that Follow:
- State the number of valence electrons in atom J.
- Which element shown forms ions with a single negative charge?
- Which metallic element is more reactive than R?
- Which element has its electrons arranged in four shells?
Fill in the blank in the following statement:
On going down in a group in the periodic table, the metallic character of elements ...............
Fill in the blank in the following statement:
The tendency to gain an electron ............... on moving down in a group of the periodic table.
For each of the following triads, name the element with the characteristics specified below:
| Elements | Least atomic radius | Chemically least reactive |
| (i) F, Cl, Br (ii) Li, Na, K |
.................... .................... |
.................... .................... |
State one reason for keeping fluorine and chlorine in the same of the periodic table.
State the trends in physical properties on moving down the group. Give an example to illustrate.
An element X belong to 4th period and 17th group, state.
name of the element.
Why fluorine has higher E.N. than chorine?
How does the number of:
valency vary on moving from left to right in the second period of the periodic table?
How do the following change on moving from left to right in a period of the periodic table?
Give examples in support of your answer.
Chemical reactivity of elements ?
An element X belong to 3rd periods and group II of the periodic table state:
the number of valence electrons,
Name the element which has the electronic configuration 2, 8, 3?
State the number of elements in periods 1, Periods 2, and Period 3 of the periodic table. Name them.
How can the valency of an element be determined if its electronic configuration is known?
Calculate the valency of element X whose atomic number is 9.
On the basis of electronic configuration, how will you identify the first and the last element of a period?
State whether the following statement is true or false
Similar electronic configuration is repeated after intervals of 2, 8, 8, 18 and 32.
What is meant by a group in the periodic table?
Atomic number of an element is 16. State
- the period to which it belongs
- the number of valence electrons
- whether it is a metal or non-metal
Choose the correct answer from the choice given:
An element A belonging to Period 3 and Group II will have
Arrange the following as per instruction given in the bracket.
Mg, Cl, Na, S, Si (decreasing order of atomic size)
Formula of ion of A is A2+. Element A probably belongs to ______ group.
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the number of valence electrons,
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the name of the element.
Name and state the following with reference to the elements of the first three periods of the periodic table.
Alkaline earth metal in period 3.
Going across a period left to right, atomic size _____.
An element A has 2 electrons in its fourth shell. State:
is it an oxidising or reducing agent
Name the elements in the correct order of their increasing atomic numbers present in the first, second, and third short periods of the periodic table.
State which of the elements are –
- metallic
- non-metallic
- noble gases
in each of the periods 2 and 3.
Name or state following with reference to the elements of the first three periods of the periodic table.
The number of electron shells in elements of period 1, period 2, and period 3.
Name or state following with reference to the element of the first three periods of the periodic table.
A non-metal in period 2 having electronic configuration 2, 6.
Name or state following with reference to the element of the first three periods of the periodic table.
The formula of the hydroxide of the element having electronic configuration 2, 8, 2.
State the following:
The group which contains highly electropositive metals including sodium.
