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प्रश्न
The number of periods and groups in the periodic table are ______
पर्याय
6, 16
7, 17
8, 18
7, 18
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उत्तर
The number of periods and groups in the periodic table is 7, 18.
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संबंधित प्रश्न
An atom has the electron structure of 2, 7.
(a) What is the atomic number of this atom?
(b) To which of the following would it be chemically similar?
7N, 15P, 17Cl, 18Ar
(c) Why would you expect it to be similar?
Find the neutral atom in the periodic table which has the same number of electrons as K+ and Cl−. What is this number?
Why was this basis of classification discarded for future classification of elements?
The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was ______.
Which of the following have inert gases 2 electrons in the outermost shell.
What is the atomic number of elements of period 3 and group 17 of the Periodic Table?
Which one of the following statements is not correct about the trends in the properties of the elements of a group on going down in a group?
The elements of group 16 are called ______
Complete the following table:
| Symbol | Atomic No | Electronic Configuration | |
| 1. | He | 2 | ______ |
| 2. | Ne | ______ | 2,8 |
| 3. | Ar | ______ | 2, 8,8 |
| 4. | Na | 11 | ______ |
The atomic number of an element 'X' is 11.
- Write the electronic configuration of X and find its valency.
- Write the formula and nature of its oxide.
