Differentiate Between Normal Elements and Transition Elements. - Science and Technology 1


Differentiate between Normal elements and Transition elements.



Normal Elements Transition Elements
Elements belonging to groups 1 and 2, and 13 to 17 are called normal elements. Elements belonging to groups 3 to 12 are called transition elements.
In these elements, all the inner
shells are completely filled except the outermost shells.
In these elements, the outermost shell and next to the outermost shell (penultimate shell) are incomplete.
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2016-2017 (March)



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?

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

 Which element 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?

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

As, C, Hg, Mg, S, Si

In the following set of elements, one element does not belong to the set. Select this element and state why it does not belong:
Oxygen, Nitrogen, Carbon, Chlorine, Fluorine

How does the number of valence electrons vary on moving from left or right in the first period of the periodic table?

In which part of a group would you separately expect the elements to have the largest atomic size?

 Given alongside is a part of the periodic table. As we move vertically downward from Li to fr?

Li Be
rA Ra 

 What happens to the size of atoms?

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)

Correct the statements.

Elements in the same periods have equal valency.

Name the type of elements .

two outermost shell incomplete – ………………

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

the number of valence electrons,

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

How can the valency of an element be determined if its electronic configuration is known?

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?

State whether the following statement is true or false
On moving horizontally across a period, number of valence electrons increases from one to eight.

Copy and complete the following sentence choosing the correct word or words from those given below, at the end of the sentence:
The similarities in the properties of elements belonging to a group are because they have the same ______ 

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

The metals of Group 2 from top to bottom are Be, Mg, Ca, Sr and Ba.State the common feature in the electronic configuration of all these elements

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)

Arrange the following as per instruction given in the bracket.

Mg, Cl, Na, S, Si (decreasing order of atomic size) 

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













State which is most reactive (i) metal (ii) non-metal


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

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

An element belongs to the third period and Group IIIA (13) of the periodic table. State: if it is a metal or non-metal?

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

Going across a period left to right, atomic size _____.

(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.

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

Halide of the elements of group thirteen

Name the elements in the correct order of their increasing atomic numbers present in the first, second, and third short periods of the periodic table.
State which of the elements are –

  1. metallic 
  2. non-metallic 
  3. noble gases

in each of the periods 2 and 3.

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 metal in period 3 having valency 3.

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.

Select the correct answer from the options given below.

It is a metal in period 2 having electronic configuration 2, 1?


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