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प्रश्न
What is the number of elements in the 1st period?
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उत्तर
There are two elements in the first period.
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संबंधित प्रश्न
Which element has two shells, both of which are completely filled with electrons?
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?
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
Give the symbol and valency of the following element and radical.
Sulphate
The longest period of the Modern Periodic Table is period.
Which of the following statements about the Modern Periodic Table is correct:
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
Noble gases are placed in the ______ group in the modern periodic table.
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 |
Write the molecular formula of the compound formed by the combination:
A and F
Define periods of modern periodic table.
