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प्रश्न
What are groups and periods in the modern periodic table?
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उत्तर
- The horizontal rows are called periods. There are seven periods in the periodic table.
- Vertical columns in the periodic table starting from top to bottom are called groups. There are 18 groups in the periodic table.
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संबंधित प्रश्न
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
Fill in the following blank with suitable word:
Group 1 elements are called ...............
Give two example of group 17 elements.
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Give the symbol and valency of the following element and radical.
Hydrogen
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
The longest period of the Modern Periodic Table is period.
What is the symbol of the element Tungsten?
Match the atomic number with the following:
An element of group 2.
