English
Maharashtra State BoardSSC (English Medium) 10th Standard

Give Scientific Reason: Atomic Size Increase Down the Group.

Advertisements
Advertisements

Question

Give Scientific Reason:
Atomic size increase down the group.
Short/Brief Note
Advertisements

Solution

Atomic size increases down the group

  1. The atomic numbers of the elements increase as we go down the group. Thus, the elements placed lower have more electrons.
  2. To accommodate these electrons new shells are added to the atom.
  3.  These new shells take the outermost electrons farther from the nucleus causing atomic size (radius) to increase as we go down the group. 
shaalaa.com
  Is there an error in this question or solution?
2016-2017 (July)

APPEARS IN

RELATED QUESTIONS

Fill in the blank:

The formulae of chloride of metal M is MCl2. The metal M belongs to ……………. group.


Elements in the same group show the same valency. Give scientific reason.


The atomic numbers of three elements A, B and C are 12, 18 and 20 respectively. State, giving reason, which two elements will show similar properties.


Consider two elements 'X' (Atomic number 17) and 'Y' (Atomic number 20)

(i) Write the positions of these elements in the modern periodic table giving justification.

(ii) Write the formula of the compound formed by the combination of 'X' and 'Y'.

(iii) Draw the electron-dot structure of the compound formed and state the nature of the bond formed between the two elements ?


Classify the following elements into metals, non-metals and metalliods

As, C, Hg, Mg, S, Si


Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?


How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way?


State one reason for keeping fluorine and chlorine in the same of the periodic table.


Which one of the following does not increase while moving down the group of the periodic table?


In each of the following pair, choose the atom having the bigger size:

Na (At. No. 11) or K (At. No. 19)


The atomic numbers of three elements A, B and C are given below:

Element Atomic number
A 5
B 7
C 10


(i) Which element belongs to group 18?
(ii) Which element belongs to group 15?
(iii) Which element belongs to group 13?
(iv) To which period/periods do these elements belong?


Periodicity is observed due to the similar ______.


How do the following change on moving from left to right in a period of the periodic table?
Give examples in support of your answer.

Chemical reactivity of elements ?


An element X belong to 3rd periods and group II of the periodic table state:

the valency,


An element X belong to 3rd periods and group II of the periodic table state:

name of the element,


Name the element which has the electronic configuration 2, 8, 3?


Name the element in period 3 which does not form oxide.


State the number of elements in periods 1, Periods 2, and Period 3 of the periodic table. Name them.


What is the common feature of the electronic configuration of the elements at the end of period 2, and period 3?


Fill in the blank 
Most electropositive elements belong to ______ group.


Explain
Size of atom changes when it loses or gain electron


Select the correct answer
Most reactive character among the elements given below is found in


Select the correct answer
Identify the metalloid


What is the common feature of electronic configurations of the elements at the end of period 2 and period 3?


Choose the correct answer from the choice given:
An element A belonging to Period 3 and Group II will have


Choose the most appropriate answer from the following list of oxides which fit the description.
An amphoteric oxide: Al2O3 (shows both acidic and basic properties)


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?


Arrange the following as per instruction given in the bracket

Na, K, Cl, S, Si (increasing ionisation potential)


Arrange the following as per instruction given in the bracket. 

Li, K, Na, H ( decreasing order of their potential ionisation ) 


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

One element of this period is missing. Which is the missing element and where should it be placed? 


Element P has atomic number 19. To which group and period, does P belong? Is it a metal or a non-metal? Why?


Name and state the following with reference to the elements of the first three periods of the periodic table.

Valency of elements in Group 14 and 15.


An element A has 2 electrons in its fourth shell. State:

its valency


Based on the group valency of element write the molecular formula of the following compound giving justification:

Compound formed when an element A of group 2 combines with an element B of group seventeen.


Name the period which is the shortest period of the periodic table.


State the property trends in general of elements on moving down in a group of the periodic table.


Name or state following with reference to the elements of the first three periods of the periodic table.

A metalloid in period 2 and in period 3.


Name or state following with reference to the element of the first three periods of the periodic table.

A non-metal in period 2 having electronic configuration 2, 6.


Name or state following with reference to the element of the first three periods of the periodic table.

The valency of the element in period 3 having atomic number 17.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×