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प्रश्न
How many groups and periods are there in the modern periodic table?
उत्तर
There are 18 groups and 7 periods in the modern periodic table.
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संबंधित प्रश्न
Fill in the blank:
The formulae of chloride of metal M is MCl2. The metal M belongs to ……………. group.
Which element has twice as many electrons in its second shell as in its first shell?
Use the letters only written in the Periodic Table given below to answer the questions that Follow :
1) State the number of valence electrons in atom J.
2) Which element shown forms ions with a single negative charge?
3)Which metallic element is more reactive than R?
4) Which element has its electrons arranged in four shells?
State the valency of the elements of periods 3 and write the formula of their oxides.
Four elements P, Q, R and S belong to the third period of the Modern Periodic Table and have respectively 1, 3, 5 and 7 electrons in their outermost shells. Write the electronic configurations of Q and R and determine their valences. Write the molecular formula of the compound formed when P and S combine.
How could the atomic radius of a noble gas be compared with the other elements in a period?
The following questions refer to the Periodic Table.
Name the first and last element in period 2.
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.
Name the period which is the shortest period of the periodic table.
Select the correct answer from the options given below.
It is a metal in period 2 having electronic configuration 2, 1?
