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प्रश्न
Classify the following elements into metals, non-metals and metalliods
As, C, Hg, Mg, S, Si
उत्तर
| Metals | Non-metals | Metalloids |
| Hg | C | Si |
| Mg | S | As |
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संबंधित प्रश्न
Elements in the same group show the same valency. Give scientific reason.
Write the number of horizontal rows in the modern periodic table. What are these rows called?
Write any one difference in the electronic configurations of group-1 and group-2 elements ?
Which element has the electronic configuration 2, 8, 2?
An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is ______.
The metal of Group 2 from top to bottom arc Be, Mg, Ca, Sr, and Ba.
1) Which one of these elements will form ions most readily and why?
2) State the common feature in the electronic configuration of all these elements.
An element Z has atomic number 16. Answer the following questions on Z:
1) State the period and group to which Z belongs
2) Is Z a metal or a non-metal?
3) State the formula between Z and hydrogen
4) What kind of a compound is this?
Name the element which is in seventeenth group and second period.
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?
How does Nature of oxides of elements change on going from left to right in a period of the periodic table?
Give examples in support of your answer.
In which part of a group would you separately expect the elements to have the greatest metallic character
Why does the size of the atoms progressively become smaller when we move from sodium (Na) to chlorine (Cl) in the third period of the periodic table?
Given alongside is a part of the periodic table. As we move vertically downward from Li to fr?
| Li | Be |
| Na | |
| K | |
| Rb | |
| Cs | |
| Fr | |
| rA | Ra |
What happens to the size of atoms?
Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are:
(a) A, B, C
(b) B, C, D
(c) A, D, E
(d) B, D, E
Which one of the following does not increase while moving down the group of the periodic table?
In each of the following pair, choose the atom having the bigger size:
(a) Mg (At. No.12) or Cl (At. No.17)
Fill in the blank:
on moving from right to left in the second period, the number of valence electrons……….
Name the non-metals present in period 2 and metals in period 3.
In the following table, the positions of six elements A, B, C, D, E and F are given as they are in the Modern Periodic Table :
 |
1 | 2 | 3-12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 2 | A | B | C | D | |||||
| 3 | E | F |
On the basis of the above table, answer the following questions :
(i) Name the element which forms only covalent compounds.
(ii) Name the element which is a metal with valency three.
(iii) Name the element which is a non-metal with valency three.
(iv) Out of B and C, whose atomic radius is bigger and why ?
(v) Write the common name for the family to which the elements D and F belong.
How do you calculate the possible valency of an element from the electronic configuration of its atoms?
K, Pb, Ca, Zn (In the increasing order of the reactivity)
How many groups and periods are there in the modern periodic table?
Select the correct answer
Number of shells in potassium are
Select the correct answer
Identify the metalloid
Name the elements in period 1.
What is meant by a group in the periodic table?
An element Z has atomic number 16. Answer the following
(a) State the period and group to which Z belongs
(b) Is Z a metal or a non-metal?
(c) State the formula between Z and hydrogen.
(d) what kind of a compund is this?
The elements of one short period of the periodic table are given below in order from left to right:
| Li | Be | B | C | O | F | Ne |
To which period do these elements belong?
The elements of one short period of the periodic table are given below in order from left to right:
| Li | Be | B | C | O | F | Ne |
One element of this period is missing. Which is the missing element and where should it be placed?
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 A has 2 electrons in its fourth shell. State:
its valency
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.
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.
Name or state following with reference to the element of the first three periods of the periodic table.
A non-metal in period 2 which is tetravalent.
Which of the following would weigh the least?
(Atomic masses C = 12, 0 = 16, Na = 23)
