Choose the Correct Answer from the Options Given Below : The Most Electronegative Element from the Following Elements is : - Chemistry


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


  •  Magnesium 

  • Chlorine 

  • Aluminium 

  • Sulphur 



Chlorine is nonmetal

∴ Most electronegative element. 

  Is there an error in this question or solution?
2018-2019 (March) Set 1



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?

An element 'X' belong to 3rd period and group 13 of the Modern Periodic Table.

(a) Determine the valence electrons and the valency of 'X'.

(b) Molecular formula of the compound formed when 'X' reacts with an element 'Y' (atomic number = 8).

(c) Write the name and formula of the compound formed when 'X' combines with chlorine

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'.

Write the number of periods the Modern Periodic Table has. State the changes in valency and metallic character of elements as we move from left to right in a period. Also state the changes, if any, in the valency and atomic size of elements as we move down a group.

List any two properties of the elements belonging to the first group of the modern periodic table.

Consider two elements 'X' (Atomic number 17) and 'Y' (Atomic number 20)

(i) Write the positions of these elements in the modern periodic table giving justification.

(ii) Write the formula of the compound formed by the combination of 'X' and 'Y'.

(iii) Draw the electron-dot structure of the compound formed and state the nature of the bond formed between the two elements ?

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

As, C, Hg, Mg, S, Si

The following table shows the electronic configuration of the elements W, X, Y, Z:

Element w x y z
2, 8, 1 2, 8, 7 2, 5 1

Answer the following questions based on the table above:

1) What type of Bond is formed between :

a) W and X

b) Y and Z

2) What is the formula of the compound formed between :

a) X and Z

b) W and X

Choose the most appropriate answer of the following:

Which of the following would weigh the least?

(A) 2-gram atoms of Nitrogen.

(B) 1mole of Silver

(C) 22.4 liters of oxygen gas at 1 atmospheric pressure and 273K

(D) 6.02 x 1023 atoms of carbon.

[Atomic masses: Ag=108, N=14, O=16, C=12]


Differentiate between Normal elements and Transition elements.

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

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

The electronic configuration of the atom of an element X is 2, 8, 4. In modern periodic table, the element is places in :

(a) 2nd group
(b) 4th group
(c) 14th group
(d) 8th group

The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element having the largest atomic radius is:

(a) Mg
(b) Na
(c) K
(d) Ca

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:

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

Why sodium element of group 1 and chlorine element of group 17 both have valency 1?

Name the type of elements .

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

State the valency of the elements of periods 3 and write the formula of their oxides.


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

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?

Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element. 

The ion of which element will migrate towards the cathode during electrolysis?

What is modern periodic law?

'In a group, the atomic radii increase with increasing period number', explain this statement and justify it with reference to group 17.

Arrange the following as per instruction given in the bracket.

K, Pb, Ca, Zn (increasing reactivity ) 

 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













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

Write the electronic configuration of element 17T35.

  1. What is the group number of T?
  2. What is the period number of T?
  3. How many valence electrons are there in an atom of T?
  4. What is the valency of T?
  5. Is it a metal or non-metal?
  6. State number of protons and neutrons in T.

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,

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.

What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 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 valency of the element in period 3 having atomic number 17.

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.


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