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प्रश्न
Name any two elements of group one and write their electronic configurations. What similarity do you observe in their electronic configurations? Write the formula of oxide of any of the aforesaid elements.
उत्तर
Two elements that belong to group 1 are lithium and sodium. The electronic configurations of these elements and the formulae of their oxides are mentioned in the table given below.
| Element | Symbol | Electronic Configuration | Formula of Oxide |
| Lithium | Li | 2, 1 | Li2O |
| Sodium | Na | 2, 8, 1 | Na2O |
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संबंधित प्रश्न
Calculate the number of gram atoms in 4.6 grams of sodium (Na = 23)
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Explain why, the properties of elements are repeated after 2, 8, 18 and 32 elements in the periodic table.
Given alongside is a part of the periodic table. As we move vertically downward from Li to fr?
| Li | Be |
| Na | |
| K | |
| Rb | |
| Cs | |
| Fr | |
| rA | Ra |
What happens to the size of atoms?
Choose the most appropriate answer from the following list of oxides which fit the description.
An amphoteric oxide: Al2O3 (shows both acidic and basic properties)
Arrange the following as per instruction given in the bracket.
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Name and state the following with reference to the elements of the first three periods of the periodic table.
Valency of elements in Group 14 and 15.
An element A has 2 electrons in its fourth shell. State:
position in the periodic table
Complete the table pertaining to the following elements given in Column I.
| Column I Elements | Atomic Number | Electronic Configuration | Underline the element present in that group |
| 1. Hydrogen | 1 | ______ | Be/Na/Ca |
| 2. Carbon | 6 | ______, ______ | N/P/Si |
| 3. Nitrogen | 7 | _______, ______ | C/P/S |
| 4. Oxygen | 8 | _______, ______ | N/S/Cl |
| 5. Sulphur | 16 | _____, ______, _______ | O/N/F |
| 6. Chlorine | 17 | _____, ______, ______ | I/O/S |
