Advertisements
Advertisements
Question
State the property trends in general of elements on moving down in a group of the periodic table.
Advertisements
Solution
Trends in a group:
- Number of shells and valence electrons: As we move down in a group the number of shells increase and valence electrons in a group remains the same.
- Valency: Valency of all elements is the same.
- Properties of elements:
(a) Metallic character increases,
(b) Non-metallic character decreases - Atomic size increases.
`"F>Cl>Br>I"/"Reactivity decreases"`
APPEARS IN
RELATED QUESTIONS
Na, Mg and Al are the elements of the same period of Modern Periodic Table having, one, two and three valence electrons respectively. Which of these elements (i) has the largest atomic radius, (ii) is least reactive? Justify your answer stating reason for each case.
What is meant by 'group' in the modern periodic table? How do the following change on moving from top to bottom in a group?
(i) Number of valence electrons
(ii) Number of occupied shells
(iii) Size of atoms
(iv) Metallic character of element
(v) Effective nuclear charge experienced by valence electrons
How does the valency of elements change of moving from left to right in the third period of the periodic table?
Fill in the blank in the following statement:
In going across a period (right to left) in periodic table, the atomic size of the atom ...............
In each of the following pair, choose the atom having the bigger size:
(a) Mg (At. No.12) or Cl (At. No.17)
An element X belong to 3rd periods and group II of the periodic table state:
the number of valence electrons,
Name the element in period 3 which does not form oxide.
Arrange the following in order of increasing radii:
N, O, P
What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3?
Select the correct answer from the options given below.
It is a period having elements from atomic no. 11 to 18.
