Write the Electronic Configuration of K and Ne. - Science and Technology 1

Advertisements
Advertisements

Write the electronic configuration of K and Ne.

Advertisements

Solution

Element Electronic configuration
K 2,8,8,1
Ne 2,8
  Is there an error in this question or solution?
2013-2014 (March)

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 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?

Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic number.


How do the valency and the atomic size of the elements vary while going from left to right along a period in the modern periodic table?


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

As, C, Hg, Mg, S, Si


Calculate the number of gram atoms in 4.6 grams of sodium (Na = 23)


Differentiate between Normal elements and Transition elements.


Fill in the blank in the following statement:

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


What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?


 In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group ?


Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are:

(a) A, B, C
(b) B, C, D
(c) A, D, E
(d) B, D, E


Where would you locate the element with electronic configuration 2, 8 in the modern 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:

(a) Mg (At. No.12) or Cl (At. No.17)


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?


Correct the statements.

Elements in the same periods have equal valency.


State the trends in chemical reactivity :

Down the group 


What is the main characteristic of the last element in each period of the periodic table? What is the general name of such elements?


An element barium has atomic number 56. Look up its position in the periodic table and answer the following questions.

Is it more or less reactive than calcium?


The electronic configuration of an element T IS 2, 8, 8, 1.

What is the period number of T?


Which element has:

twice as many electrons in its second shell as in its first shell?


Calculate the valency of element X whose atomic number is 9.


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?

How many groups and periods are there in the modern periodic table?


an element has an atomic number 16. State

  1. the period to which it belongs
  2. the number of valence electrons
  3. whether it is a metal or non-metal

 The position of elements A, B, C, D and E in the periodic table are shown below:

Group 1

Group 2

Group 17

Group 18

 

 

 

D

 

B

C

 

A

 

 

E

Which is larger in size (i) D or E (ii) B or C


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


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

Non-metallic elements present in Period 3 of Groups 15 and 16.


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

is it a metal or non-metal


(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.


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


Copy and complete the following sentence choosing the correct word or words from those given in bracket at the end the sentence:

The similarities in the properties of a group of elements are because they have the same _________.


What is meant by a Group in the Periodic Table?


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.


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 ________.


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

Down a group in the Modern Periodic Table.
No. of electron shells __________; No. of valence electrons ________; Electronegativity ________ Character of elements changes from _________ to ____________.


Electron Affinity is maximum in ______.


Share
Notifications



      Forgot password?
Use app×