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प्रश्न
Write a scientific reason.
Atomic radius goes on increasing down a group.
Give scientific reasons:
Atomic radius goes on increasing down the ‘group’.
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उत्तर
- Atomic radius increases as we move from top to bottom in a group because a new shell of electrons is added to the atoms at every step.
- The number of electron shells increases gradually, due to which the size of the atoms increases.
- As the size of the atoms increases, it leads to an increase in the atomic radius.
- The distance between the nucleus and the outermost electrons increases, so the attractive force of the nucleus decreases.
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संबंधित प्रश्न
Arrange the following as per the instruction given in the brackets:
Na, K, Li (Increasing atomic size)
Give the trends in atomic size on moving down the group.
Give the trends in atomic size on moving across the period left to right.
Why is the size of sodium is greater than magnesium?
Write the name and symbol of the element from the description.
The atom having the smallest atomic mass.
Give scientific reasons for the following:
Atomic radius goes on decreasing while going from left to right in a period.
Among the elements of the second period, Li to Ne, pick out the element with the largest atomic size
Fill in the blanks.
Size of the atoms ______ from left to right across a period and ______ on descending in a group of normal elements.
The changes in the properties of elements on moving from left to right across a period of the Periodic Table. For the property, choose the correct answer.
The atomic size:
_______ is the distance between the nucleus of the atom and its outermost shell.
While going from top to bottom in a group the atomic radius ______.
Right or wrong sentence.
Moving from left to right, the size of the atom decreases.
An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?
Which of the following gives the correct increasing order of the atomic radii of O, F, and N?
Arrange the following elements in increasing order of their atomic radii.
- Li, Be, F, N
- Cl, At, Br I
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide.
- Where in the periodic table are elements X and Y placed?
- Classify X and Y as metal (s), non-metal (s) or metalloid (s)
- What will be the nature of oxide of element Y? Identify the nature of bonding in the compound formed
- Draw the electron dot structure of the divalent halide
The diagram below shows part of the periodic table.
- Which elements would react together to form covalent compounds?
- Between the two elements W and Z, which will have a bigger atomic radius? Why?
Arrange the following in order of increasing radii:
Cl−, Cl
Explain your choice.
This question refers to the elements of the Periodic Table with atomic numbers from 3 to 18. Some of the elements are shown by letters, but the letters are not the usual symbols of the elements.
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| A | B | C | D | E | F | G | H |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| I | J | K | L | M | N | O | P |
Which of these have least atomic size in period 3?
