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प्रश्न
Mendeleev's periodic table : atomic mass : : Modern periodic table : _______
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उत्तर
Mendeleev's periodic table : atomic mass : : Modern periodic table : atomic number
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
How many rows and columns are there in the modern periodic table?
Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
On which side of the periodic table will you find metals?
Explain why, the noble gases are placed in a separate group.
The three elements having chemical symbols of Si, B and Ge are:
(a) all metals
(b) all non-metals
(c) all metalloids
(d) Si is metalloid, B is metal and Ge is non-metal
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same group of the periodic table?
Which element has the electronic configuration 2, 8, 2?
How would the tendency to gain electrons change on moving from left to right in a period of the periodic table?
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
Give the group number of following elements present in periodic table
Name two elements in Inert gas.
Name two elements in each case: Lanthanides
Name two elements in each case:
Actinides
Name the type of elements which have outermost shell complete.
State its position in the periodic table?
How will the tendency to gain electrons change as we go from left to right across a period? Why?
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
Name and state the following with reference to the elements of the first three periods of the periodic table.
A covalent compound formed by an element in period 2 and a halogen.
Name an element of group 18 which can form compounds.
Define the atomic size.
Give the symbol and valency of the following element and radical.
Hydrogen
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
State the number of elements in Period 2 of the Periodic Table.
What are the elements.
What are the periods in a periodic table?
The d-block elements are called as _______ elements.
Find the odd one out and give its explanation.
The modern periodic table is divided into which blocks?
Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.
| Periods | Group 2 | Group 17 |
| 2 | ----- | A |
| 3 | B | ----- |
| 4 | ----- | C |
- What is A element metal or nonmetal?
- Which is the outermost orbit of element B?
- Identify C element and it's physical state.
Explain structure of modern periodic table in short.
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has a similar structure to diamond.
Spot the error:
The elements of group 13 are called the carbon family.
- Write the electronic configuration of element X, given by its symbol as under: \[\ce{^40_20 X}\]
- Determine its position in the modem periodic table.
- What is the nature of its oxide?
- Name one other element of its group.
Name the metalloids in the first twenty elements.
