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प्रश्न
What are the periods in a periodic table?
उत्तर
“Horizontal rows from left to right in a periodic table are called periods.”
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संबंधित प्रश्न
What is the name of those elements which divide metals and non-metals in the periodic table?
What is the usual number of valence electrons and valency of group 18 elements of the periodic table?
What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71?
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Bicarbonate
Identify gas A in the following experiment.
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Which of the element is a Metalloid?
Match the atomic number with the following:
A rare gas.
