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प्रश्न
An element A has 2 electrons in its fourth shell. State:
its valency
उत्तर
Its valency is 2.
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संबंधित प्रश्न
Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic number.
How do the atomic size and metallic character of elements vary as we move :-
(a) down a group and
(b) from left to right in a period
State the trends in physical properties on moving down the group. Give an example to illustrate.
name the elements in period 1.
The following questions refer to the Periodic Table.
Name the first and last element in period 2.
Use the letters only written in the Periodic Table given below to answer the questions that follow:
(a) State the number of valence electrons in the atom J.(b) Which element shown forms ions with a single negative charge?
(c) Which Metallic element is more reactive than R?
(d) Which element has its electrons arranged in four shells?
Arrange the following in order of increasing radii:
N, O, P
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the name of the element.
Name the period which is the shortest period of 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 |
