Write the Number of Vertical Columns in the Modern Periodic Table. What Are These Columns Called? - Science


Write the number of vertical columns in the modern periodic table. What are these columns called?



There are 18 vertical columns in the modern periodic table and these are known as groups.

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2013-2014 (March) Delhi Set 1

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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?

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.

An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number, period number and valency of 'X'.

The elements 4Be, 12Mg and 20Ca, each having two valence electrons in their valence shells, are in periods 2, 3 and 4 respectively of the modern periodic table. Answer the following questions associated with these elements, giving reason in each case:

(a) In which group should they be?

(b) Which one of them is least reactive?

(c) Which one of them has the largest atomic size?

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

Differentiate between Normal elements and Transition elements.

The atomic radii of three elements X, Y and Z of a period of the periodic table are 186 pm; 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.


 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.

 Explain why, the properties of elements are repeated after 2, 8, 18 and 32 elements in the periodic table.

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?

Name the type of elements .

two electrons in the outermost orbit - ……………

State the trends in chemical reactivity:

(i) across the periods left to right

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

name of the element.

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

How do you calculate the possible valency of an element from the electronic configuration of its atoms?

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?

K, Pb, Ca, Zn (In the increasing order of the reactivity) 

Explain, the statement 'In each period, the atomic radii gradually decrease with increase in atomic number'. Give one example to justify your answer.

Name the elements in period 1.

Consider the section of the periodic table given below :

  1 2 13 14 15 16 17 18
  Li   D     O J Ne
  A Mg E Si   H K  
  B C   F G     L

With reference to the table, answer the following :
(i) Which is the most electro negative ?
(ii) How many valence electrons are present in G ?
(iii) Write the formula of the compound between B and H ?
(iv) In the compound between F and J, what type of bond will be formed ?
(v) Draw the electron dot structure for  the compound formed between C and K.

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

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

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

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.

State the nature of compounds formed when group 17 elements combine with (i) metals (ii) non-metals.

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.

Based on the group valency of element write the molecular formula of the following compound giving justification:
Oxide of first group elements.

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 _________.

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 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.

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 metal in period 2 having electronic configuration 2, 1?


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