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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
संबंधित प्रश्न
Elements in the same group show the same valency. Give scientific reason.
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'.
Write the number of vertical columns in the modern periodic table. What are these columns called?
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.
Which element has a total of two shells, with three electrons in its valence shell?
An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is ______.
How do electronic configurations of elements change in second period of periodic table with increase in atomic numbers?
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?
How does the electropositive character of elements change on going down in a group of the periodic table?
In which part of a group would you separately expect the elements to have the greatest metallic character
In which part of a group would you separately expect the elements to have the largest atomic size?
The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is:
(a) A and B
(b) B and D
(c) A and C
(d) D and E
Why sodium element of group 1 and chlorine element of group 17 both have valency 1?
Periodicity is observed due to the similar ______.
Correct the statements.
Elements in the same periods have equal valency.
An element X belong to 4th period and 17th group, state.
name the family to which it belong.
Why fluorine has higher E.N. than chorine?
An element X belong to 3rd periods and group II of the periodic table state:
the valency,
Name the element in period 3 which does not form oxide.
F, Cl and Br are the elements each having seven valence electrons. Which of these (i) has the largest atomic radius, (ii) is most reactive? Justify your answer stating reason for each.
Calculate the valency of element X whose atomic number is 9.
Atomic number of metal ‚A‛ is 11, while atomic number of metal ‚B‛ is 20. Which of them will be more reactive? Write the chemical reaction of dilute HCl with metal ‚A‛.
Select the correct answer
Identify the metalloid
Parts (i) to (v) refer to changes in the properties of elements on moving from left to right across a period of the periodic table. For each property, choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d).
(i) The non metallic character of the elements:
(a) Decreases
(b) Increases
(c) Remains the same
(d) Depends on the period
(ii) The electro negativity
(a) Depends on the number of valence electrons
(b) Remains the same
(c) Decreases
(d) Increases
(iii) The ionization potential
(a) Goes up and down
(b) Decreases
(c) Increases
(d) Remains the same
(iv) The atomic size
(a) Decreases
(b) Increases
(c) Remains the same
(d) Sometimes increases and sometimes decreases
(v) The electron affinity of the elements in groups 1 to 7:
(a) Goes up and down
(b) Decreases and then increases
(c) Increases
(d) decreases
The following questions refer to the Periodic Table.
What is the common feature of the electronic configurations of the elements in group 7?
Consider the section of the periodic table given below :
| Group numbers |
IA | IIA | IIIA | IVA | VA | VIA | VIIA | O |
| 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 | |
| Li | D | O | J | Ne | ||||
| A | Mg | E | Si | H | K | |||
| B | C | F | G | L |
With reference to the table, answer the following :
(i) Which is the most electro negative ?
(ii) How many valence electrons are present in G ?
(iii) Write the formula of the compound between B and H ?
(iv) In the compound between F and J, what type of bond will be formed ?
(v) Draw the electron dot structure for the compound formed between C and K.
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
Na, K, Cl, S, Si (increasing ionisation potential)
The position of elements A, B, C, D and E in the periodic table are shown below:
|
Group 1 |
Group 2 |
Group 17 |
Group 18 |
|
|
|
|
D |
|
|
B |
C |
|
|
A |
|
|
E |
Which type of ion will be formed by elements A, B, and C.
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the name of the element.
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
Based on the group valency of element write the molecular formula of the following compound giving justification:
Compound formed when an element A of group 2 combines with an element B of group seventeen.
Supply the missing word from those in bracket:
If an element has one electron in its outermost energy level [shell] then it is likely to be _______.
State the property trends in general of elements on moving from left to right in a period of the periodic table.
