Which Element Has Twice as Many Electrons in Its Second Shell as in Its First Shell? - Science

Advertisements
Advertisements

Which element has twice as many electrons in its second shell as in its first shell?

Advertisements

Solution 1

 Carbon

Solution 2

Carbon is the element with twice as many electrons in its second shell as its first shell. The atomic number of carbon is 6 and its electronic configuration is 2,4.
Electronic configuration:- Shells:                   K L
                                          Electrons arranged: 2 4

  Is there an error in this question or solution?
Chapter 5: Periodic Classification Of Elements - Exercise 1 [Page 284]

APPEARS IN

Lakhmir Singh Class 10 Chemistry (Science)
Chapter 5 Periodic Classification Of Elements
Exercise 1 | Q 47.5 | Page 284
NCERT Science Class 10
Chapter 5 Periodic Classification of Elements
Exercises | Q 3.5 | Page 91

Video TutorialsVIEW ALL [2]

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.


Write the electronic configuration of K and Ne.


The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.

  1. Calculate the average atomic mass of elements A and C.
  2. Compare the average atomic mass with atomic mass of B.
  3. What could the elements A, B and C be?

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.


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

As, C, Hg, Mg, S, Si


Differentiate between Normal elements and Transition elements.


In the following set of element, one element does not belong to the set. Select this element and state why it does not belong:
Calcium, Magnesium, Sodium, Beryllium


Fill in the blank in the following statement:

On moving form right to left in the second period, the number of valency electrons ...............


Fill in the blank in the following statement:

On going down in a group in the periodic table, the metallic character of elements ...............


How does the electropositive character of elements change on going down in a group of the periodic table?


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


The element which has the maximum number of valence electrons is:
(a) Na
(b) P
(c) Si
(d) A


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


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


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

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


An element X belong to 4th period and 17th group, state.

name the family to which it belong.


The given table shows elements with the same number of electrons in its valence shell.

Elements A B C
m.p. 63.0 180.0 97.0

(i) Whether these elements belong to same group or period.

(ii) Arrange them in order of increasing metallic character.


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

name of the element,


Name

The element of lower nuclear charge out of Be and Mg.


Chorine in the periodic table is surrounded by the elements with atomic number 9, 16, 18 and 35.

Which of these have physical and chemical properties resembling chlorine.


Chorine in the periodic table is surrounded by the elements with atomic number 9, 16, 18 and 35.

Which is more electronegative than chlorine


An element 'X' (Atomic number – 20) burns in the presence of oxygen to form a basic oxide.
(a) Identify the element and write its electronic configuration.
(b) State its group number and period number in the Modern Periodic Table.
(c) Write a balanced chemical equation for the reaction when this oxide is dissolved in water.


Atomic number of metal ‚A‛ is 11, while atomic number of metal ‚B‛ is 20. Which of them will be more reactive? Write the chemical reaction of dilute HCl  with metal ‚A‛.


Taking into consideration the period of the elements given below, answer the following questions: 

Elements Atomic Radius (pm)
O 66
B 88
C 77
N 74
Be 111
Li 152
  1. Arrange the above elements in decreasing order of their atomic radii.
  2. State the period to which the above elements belong.
  3. Why this arrangement of elements is similar to the above period of modern periodic table?
  4. Which of the above elements have the biggest and the smallest atom?
  5. What is the periodic trend observed in the variation of atomic radius while going from left to right within a period?

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


Refering to changes in the properties of elements on moving from left to right across a period of the periodic table. Choose the correct answer. 

The electronegativity


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 

Place the three elements: Fluorine, Beryllium and nitrogen in the order of increasing electronegativity


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 

Which one of the above element belongs to the halogen series?


An element belongs to the third period and Group IIIA (13) of the periodic table. State: the number of valence electrons,


Write down the word that will correctly complete the following sentence:

Moving left to right in the second period, the number of valence electrons _____. 


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

position in the periodic table


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

is it an oxidising or reducing agent 


(a) Fill in the blanks and rewrite the completed statements: 

(i) ________ group in the periodic table contains elements that are all gases at room temperature. 

(ii) Very fine particles mainly scatter ______ light.


Fill in the blank and rewrite the completed statement:

________ group in the periodic table contains elements that are all gases at room temperature.


Give Scientific Reason:
Atomic size increase down the group.

Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.


State the property trends in general of elements on moving from left to right in a 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 element of the first three periods of the periodic table.

The valency of elements in group 1 [I–A].


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

A non-metal in period 2 which is tetravalent.


Select the correct answer from the options given below.

It is a period having elements from atomic no. 11 to 18.


Give a reason for the following:

A transition from metallic to non-metallic elements is seen on moving from left to right in a period of the periodic table.


Share
Notifications



      Forgot password?
Use app×