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प्रश्न
Write the number of horizontal rows in the modern periodic table. What are these rows called?
उत्तर
There are seven horizontal rows in the modern periodic table; these rows are called periods.
संबंधित प्रश्न
From the following elements :
4Be; 9F; 19K; 20Ca
(i) Select the element having one electron is the outermost shell.
(ii) two elements of the same group.
Write the formula of and mention the nature of the compound formed by the union of 19K and element X(2, 8, 7).
The atomic radii of three elements X, Y and Z of a period of the periodic table are 186 pm; 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.
State one reason for keeping fluorine and chlorine in the same of the periodic table.
In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group ?
How does the number of:
valency vary on moving from left to right in the second period of the periodic table?
Write two reasons responsible for late discovery of noble gases ?
How many groups and periods are there in the modern periodic table?
Fill in the blank
Oxidising property ________from fluroine to iodine because the power to accpet electron decreases.
What is meant by a group in the periodic table?
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 |
State which is metals, non-metals, and noble gas in this table.
