Advertisements
Advertisements
Question
Write an explanation.
Atomic radius
Advertisements
Solution
Atomic radius is the distance from an atom’s nucleus to its outermost electron shell and is used to represent the size of an atom; it is usually given in picometres. Because electrons form a diffuse cloud, atomic radius is an approximate measure rather than a fixed boundary. Across a period the atomic radius decreases as increasing nuclear charge pulls the same-shell electrons closer, while down a group the radius increases because each successive element has an extra electron shell.
APPEARS IN
RELATED QUESTIONS
Arrange the following as per the instruction given in the brackets:
Na, K, Li (Increasing atomic size)
Arrange the elements of second and third periods in increasing order of their atomic size (excluding noble gases).
Why is the size of neon greater than fluorine?
Why is the size of sodium is greater than magnesium?
Which is greater in size an atom or an anion?
Which is greater in size Fe2+ or Fe3+?
Fill in the blank:
On moving across a period from right to left in the periodic table, the atomic size of the atom ___________.
Write the name and symbol of the element from the description.
The atom having the smallest size.
What happens to the atomic size of elements on moving from left to right in a period?
_______ is the distance between the nucleus of the atom and its outermost shell.
Right or wrong sentence.
Nanometer unit is used to measure atomic radius.
Some elements and their atomic radii are given here. Arrange them in decreasing order of their atomic radii. Identify which of the above elements is the biggest atom and which is smallest?
| Element | K | Na | Rb | Cs | Li |
| Atomic radius (pm) | 231 | 186 | 244 | 262 | 151 |
Write information about the given atomic numbers in the table.
| Atomic Number | Electronic configuration | Group | Period | Element |
| 10 | ||||
| 20 | ||||
| 7 |
Which of the following is the correct order of atomic size?
Which of the following gives the correct increasing order of the atomic radii of O, F, and N?
Atomic number of a few elements are given below
10, 20, 7, 14
- Identify the elements
- Identify the Group number of these elements in the Periodic Table
- Identify the Periods of these elements in the Periodic Table
- What would be the electronic configuration for each of these elements?
- Determine the valency of these elements
Arrange the following as per the instruction given in the bracket:
Carbon, Fluorine, Beryllium (decreasing order of atomic size).
Which one of the following has the largest atomic radius?
Give reason for the following:
The size of a Cl− ion is greater than the size of a Cl atom.
