How Many Groups and Periods Are There in the Modern Periodic Table? - Science

Advertisements
Advertisements

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

Advertisements

Solution

There are 18 groups and 7 periods in the modern periodic table.

  Is there an error in this question or solution?
2014-2015 (March) Delhi Set 1

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?

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.


What is meant by 'group' in the modern periodic table? How do the following change on moving from top to bottom in a group?

(i) Number of valence electrons

(ii) Number of occupied shells

(iii) Size of atoms

(iv) Metallic character of element

(v) Effective nuclear charge experienced by valence electrons


 Which element has two shells, both of which are completely filled with electrons?


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


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


Name the element which is in  first group and third period.


Fill in the blank in the following statement:

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


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.

 


For each of the following triads, name the element with the characteristics specified below:

Elements Least atomic radius Chemically least reactive
(i) F, Cl, Br
(ii) Li, Na, K
....................
....................
....................
....................

 


Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?


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


Correct the statements.

Copper and zinc are representative elements.


State the name assigned to this group?


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

no of valence electrons in it


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?

Choose the correct answer from the options given below : 
 The most electronegative element from the following elements is : 


Copy and complete the following sentence choosing the correct word or words from those given below, at the end of the sentence:
The properties of the elements are a periodic function of their __________.


Copy and complete the following sentence choosing the correct word or words from those given in the brackets, at the end of the sentence.
Moving across a ______ of the periodic table, the elements show increasing ______ character. (group, period, metallic, non metallic)


Parts (i) to (v) refer to changes in the properties of elements on moving from left to right across a period of the periodic table. For each property, choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d).
(i) The non metallic character of the elements:
(a) Decreases
(b) Increases
(c) Remains the same
(d) Depends on the period
(ii) The electro negativity
(a) Depends on the number of valence electrons
(b) Remains the same
(c) Decreases
(d) Increases
(iii) The ionization potential
(a) Goes up and down
(b) Decreases
(c) Increases
(d) Remains the same
(iv) The atomic size
(a) Decreases
(b) Increases
(c) Remains the same
(d) Sometimes increases and sometimes decreases
(v) The electron affinity of the elements in groups 1 to 7:
(a) Goes up and down
(b) Decreases and then increases
(c) Increases
(d) decreases


In the above table, H does not represent hydrogen.Some elements are given in their own symbol and position in the periodic table while others are shown with a letter. With refrence to the table answer the following questions.
1. Identify the most electronegative element.
2. Identify the most reactive element of Group I.
3. Identify the element from Period 3 with least atomic size.
4. How many valence electrons are present in Q?
5. Which element from group 2 would have the least ionisation energy?
6. Identify the noble gas of the fourth period.
7. In the compound between A and H, what type of bond would be formed and give its molecular formula.


Arrange the following as per instruction given in the bracket.

Cs, Na, Li, K, Rb (increasing metallic character) 


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 ionization potential : 


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 type of ion will be formed by elements A, B, and C.

 


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


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


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.


(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.


Supply the missing word from those in bracket:

If an element has one electron in its outermost energy level [shell] then it is likely to be _______.


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


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

A covalent compound formed between an element in period 1 and a halogen.


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.

Is the group number of the element whose atomic number is 4.


Complete the table pertaining to the following elements given in Column I.

Column I Elements Atomic Number Electronic Configuration Underline the element present in that group
1. Hydrogen 1 ______ Be/Na/Ca
2. Carbon 6 ______, ______ N/P/Si
3. Nitrogen 7 _______, ______ C/P/S
4. Oxygen 8 _______, ______ N/S/Cl
5. Sulphur 16 _____, ______, _______ O/N/F
6. Chlorine 17 _____, ______, ______ I/O/S

Share
Notifications



      Forgot password?
Use app×