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प्रश्न
State the number of elements in Period 1 of the Periodic Table.
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उत्तर
Period 1 is the shortest period has 2 elements
संबंधित प्रश्न
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Write the merits of the modern periodic table over Mendeleev’s Periodic table
Give alongside is a part of the periodic table :
As we move horizontally from left to right:
| Li | Be | B | C | N | O | F | |
| Na | Mg | Al | Si | P | S | Cl |
(i) What happens to the metallic character of the elements?
(ii) What happens to the atomic size?
State whether the following statement is true or false:
On going down in a group of the periodic table, the number of valence electrons increases.
Explain why all the elements of a period have different chemical properties.
(b) What is the number of elements is 3rd period, the modern periodic table?
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
Give the symbol and valency of the following element and radical.
Hydrogen
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
