Write Any One Difference in the Electronic Configurations of Group-1 and Group-2 Elements ? - Science

Advertisements
Advertisements

Write any one difference in the electronic configurations of group-1 and group-2 elements ?

Advertisements

Solution

The valence electrons in the 1st group is 1 and that of the 2nd group is 2.

  Is there an error in this question or solution?
2013-2014 (March) Delhi Set 3

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?

The atomic numbers of three elements A, B and C are 12, 18 and 20 respectively. State, giving reason, which two elements will show similar properties.


An element 'M' with electronic configuration (2, 8, 2) combines separately with (NO3), (SO4)2– and (PO4)3– radicals. Write the formula of the three compounds so formed. To which group and period of the Modern Periodic Table does the element 'M' belong? Will 'M' form covalent or ionic compounds? Give reason to justify your answer.


Which element has  the electronic configuration 2, 8, 2?


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

As, C, Hg, Mg, S, Si


Differentiate between Normal elements and Transition elements.


How does the valency of elements change of moving from left to right in the third period of the periodic table?


Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?


How does the atomic size vary on going down from top to bottom in a group of the periodic table? Why does it vary this way?


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


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?


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

name of the element.


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

name the family to which it belong.


Which element has:

a total of three shells with five electrons in its valence shell?


Name

The element of period 3 with valency 4


First ionization enthalpy of two elements X and Y are 500 KJ  mol-1 and 375 KJ mol-1 respectively. Comment about their relative position in a group as well as in a period. 


On the basis of electronic configuration, how will you identify the first and the last element of a period?


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?

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


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 below, at the end of the sentence:
The similarities in the properties of elements belonging to a group are because they have the same ______ 


A group of elements in the periodic table is given below ( Boron is the first member of the group and thallium is the last)
Boron
Aluminium
Gallium
Indium
Thallium
Answer the following questions in relation to the above group of elements:
(a) Which element has the most metallic character?
(b) Which element would be expected to have the highest electro negativity?
(c) If the electronic configuration of aluminium is 2, 8, 3, how many electrons will be there in the outermost shell of thallium?
(d) The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine.
(e) Will the elements in the group to the right of this boron group be more metallic or less metallic in character? Justify your answer.


The following questions refer to the Periodic Table.
Name the first and last element in period 2.


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:

Moving left to right in the second period, the number of valence electrons _____. 


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

Moving down in the second group, number of valence electrons___________.


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

position in the periodic table


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:

Compound formed when an element A of group 2 combines with an element B of group seventeen.


Name the elements in Period 1.


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 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.

The valency of elements in group 1 [I–A].


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×