Advertisements
Advertisements
Question
Solution
Atomic size increases down the group
- The atomic numbers of the elements increase as we go down the group. Thus, the elements placed lower have more electrons.
- To accommodate these electrons new shells are added to the atom.
- These new shells take the outermost electrons farther from the nucleus causing atomic size (radius) to increase as we go down the group.
APPEARS IN
RELATED QUESTIONS
Fill in the blank:
The formulae of chloride of metal M is MCl2. The metal M belongs to ……………. group.
Two elements ‘P’ and ‘Q’ belong to the same period of the modern periodic table and are in Group 1 and Group 2, respectively. Compare their following characteristics in tabular form:-
(a) The number of electrons in their atoms
(b) The sizes of their atoms
(c) Their metallic character
(d) Their tendencies to lose electrons
(e) The formula of their oxides
(f) The formula of their chlorides
Two elements ‘A’ and ‘B’ belong to the 3rd period of Modern periodic table and are in group 2 and 13, respectively. Compare their following characteristics in tabular form:-
(a) Number of electrons in their atoms
(b) Size of their atoms
(c) Their tendencies to lose electrons
(d) The formula of their oxides
(e) Their metallic character
(f) The formula of their chlorides
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
List any two properties of the elements belonging to the first group of the modern periodic table.
The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7 electrons in the outermost shell respectively. State the period in which these elements can be placed in the modern periodic table. Write the electronic configuration of the atoms of A and D and the molecular formula of the compound formed when A and D combine.
Write any one difference in the electronic configurations of group-1 and group-2 elements ?
Name the element that has two shells, both of which are completely filled with electrons.
Which element has twice as many electrons in its second shell as in its first shell?
Calculate the number of gram atoms in 4.6 grams of sodium (Na = 23)
What happens to the metallic character of the elements as we go down in a group of the periodic table?
Name the element which is in first group and third period.
Rewrite the following statement after correction, if necessary:
The metallic character of elements in a period increases gradually on moving from left to right.
An element X belongs to group 2 and another element Y belongs to group 15 of the periodic table:
(a) What is the number of valence electron in X?
(b) What is the valency of X?
(c) What is the number of valence electrons in Y?
(d) What is the valency of Y?
Explain how you have arrived at your answers.
How does Chemical reactivity of elements change on going from left to right in a period of the periodic table?
Give example in support of your answer.
Why do elements in the same group show similar properties but the elements in different groups show different properties?
For each of the following triads, name the element with the characteristics specified below:
Elements | Least atomic radius | Chemically least reactive |
(i) F, Cl, Br (ii) Li, Na, K |
.................... .................... |
.................... .................... |
In which part of a group would you separately expect the elements to have the greatest metallic character
Which of the following element would lose an electron easily?
(a) Mg
(b) Na
(c) K
(d) Ca
Which of the following element does not lose an electron easily?
(a) Na
(b) F
(c) Mg
(d) Al
Which of the following set of elements is written correctly in the order of their increasing metallic character?
(a) Mg, Al, Si
(b) C, O, N
(c) Na, Li, K
(d) Be, Mg, Ca
What is its atomic number?
Which element has:
twice as many electrons in its second shell as in its first shell?
Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element.
The ion of which element will migrate towards the cathode during electrolysis?
Select the correct answer
Identify the metalloid
Name the elements in period 1.
The following questions refer to the Periodic Table.
Name the first and last element in period 2.
Choose the correct answer from the choice given:
An element A belonging to Period 3 and Group II will have
The elements of one short period of the periodic table are given below in order from left to right:
Li | Be | B | C | O | F | Ne |
To which period do these elements belong?
Element P has atomic number 19. To which group and period, does P belong? Is it a metal or a non-metal? Why?
State the nature of compounds formed when group 17 elements combine with (i) metals (ii) non-metals.
Moving left to right in the second period, the number of valence electrons _____.
Name the elements in Period 1.
Name or state following with reference to the element of the first three periods of the periodic table.
The non-metallic element present in period 3 other than sulphur and chlorine.
Select the correct answer from the options given below.
It is a period having elements from atomic no. 11 to 18.
Fill in the blanks from the words A to F given below’.
A: Decreases
B: Increases
C: Remains same
D: Increases by one
E: Electropositive
F: Electronegative
Across a period from left to right in the Modern Periodic Table.
No. of electron shells _________; No. of valence electrons __________: Electronegativity increases Character of elements changes from electropositive to ________.
State the following:
The group to which the element with an electronic configuration of 2, 8, 2 belongs.