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प्रश्न
Which of the following have inert gases 2 electrons in the outermost shell.
विकल्प
He
Ne
Ar
Kr
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उत्तर
He
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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?
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a compound.
(a) Write the position of these elements in the modern periodic table.
(b) Write the formula of the compound formed.
Justify your answer in each case.
Elements belonging to the same group have the same valency.
The number of periods and groups in the periodic table are ______
Moseley’s periodic table is based on atomic mass.
Identify the bond between H and F in the HF molecules.
An element X from group 2 of the Periodic Table reacts with Y from group 17 to form a compound. Give the formula of the compound.
The atom of an element has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar?
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 | ______ |
