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प्रश्न
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?
उत्तर
(a) The element J is placed in the 5th group; hence, its number of valence electrons is 5.
(b) The element M which is placed in the 7th group has 7 valence electrons and will gain only one electron to complete its octet; hence, element M will show a single negative charge.
(c) Element T is more reactive than element R because chemical reactivity increases down the group.
(d) Only element T is placed in the 4th period; hence, its electrons are arranged in four shells.
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संबंधित प्रश्न
How does the valency of elements change of moving from left to right in the third period of the periodic table?
Arrange the following elements in the increasing order of their metallic character:
Mg, Ca, K, Ga
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?
Why sodium element of group 1 and chlorine element of group 17 both have valency 1?
Fill in the blank
There are ______ groups and ______ periods in the modern form of periodic table.
Copy and complete the following sentence choosing the correct word or words from those given below, at the end of the sentence:
The similarities in the properties of elements belonging to a group are because they have the same ______
Parts (i) to (v) refer to changes in the properties of elements on moving from left to right across a period of the periodic table. For each property, choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d).
(i) The non metallic character of the elements:
(a) Decreases
(b) Increases
(c) Remains the same
(d) Depends on the period
(ii) The electro negativity
(a) Depends on the number of valence electrons
(b) Remains the same
(c) Decreases
(d) Increases
(iii) The ionization potential
(a) Goes up and down
(b) Decreases
(c) Increases
(d) Remains the same
(iv) The atomic size
(a) Decreases
(b) Increases
(c) Remains the same
(d) Sometimes increases and sometimes decreases
(v) The electron affinity of the elements in groups 1 to 7:
(a) Goes up and down
(b) Decreases and then increases
(c) Increases
(d) decreases
Name and state the following with reference to the elements of the first three periods of the periodic table.
Non-metallic elements present in Period 3 of Groups 15 and 16.
The electronic configuration of an element is 2, 8, 4. State it:
group and period in the Modern Periodic Table.
Name the period which is the shortest period of the periodic table.
