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महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in ______.

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प्रश्न

Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in ______.

पर्याय

  • Group 2

  • Group 16

  • Period 2 

  • d-block

MCQ
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उत्तर

Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in Group 2.

Explanation:

Alkaline Earth Metals include Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba), and Radium (Ra). These elements have valency 2 because they have two electrons in their outermost shell (s-orbital). In the Modern Periodic Table, elements are arranged in groups and periods based on their electronic configuration. All Alkaline Earth Metals belong to Group 2.

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पाठ 2: Periodic Classification of Element - Exercise [पृष्ठ २८]

संबंधित प्रश्‍न

Rewrite the following statement after correction, if necessary:

 Isotopes are the elements of the same group.


An element Y is in second period and group 16 of the periodic table:

(i) Is it a metal or non-metal?
(ii) What is the number of valence electrons in its atom?
(iii) What is its valency?
(iv) What is the name of the element?
(v) What will be the formula of the compound formed by Y with sodium?


An element X combines with oxygen to form an oxide XO. This oxide is electrically conducting.

(a) How many electrons would be there in the outermost shell of the element X?
(b) To which group of the periodic tables does the element X belong?
(c) Write the formula of the compound formed when X reacts with chlorine.


Write the names and symbols of two very reactive metals belonging to group 1 of the periodic table. Explain by drawing electronic structure, how either one of the two metals reacts with a halogen. With which name is the bond formed between these elements known and what is the class of the compound so formed known? State any four physical properties of such compounds.


The elements Li, Na and K, each having one valence electron, are in period 2, 3 and 4 respectively of modern periodic table.

(i) In which group of the periodic table should they be ?

(ii) Which one of them is least reactive ?

(iii) Which one of them has the largest atomic radius ? Give reason in justify your answer in each case.


Elements belonging to the same group have the same valency.


The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was ______.


State whether true or false. If false, correct the statement.

Metals can gain electrons.


______ group contains the member of the halogen family.


The elements A, B, and C belong to groups 1, 14, and 17 respectively of the Periodic Table. Which two elements will form ionic compounds?


Which one of the following statements is not correct about the trends in the properties of the elements of a group on going down in a group?


The elements of group 16 are called ______ 


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


An element with the atomic number 40 is placed in the period.  


Complete the following cross word puzzle 

Across:

(1) An element with atomic number 12.

(3) Metal used in making cans and member of Group 14.

(4) A lustrous non-metal which has 7 electrons in its outermost shell.

Down:

(2) Highly reactive and soft metal which imparts yellow colour when subjected to flame and is kept in kerosene.

(5) The first element of second Period

(6) An element which is used in making fluorescent bulbs and is second member of Group 18 in the Modern Periodic Table

(7) A radioactive element which is the last member of halogen family.

(8) Metal which is an important constituent of steel and forms rust when exposed to moist air.

(9) The first metalloid in Modern Periodic Table whose fibres are used in making bullet-proof vests


An element X of group 15 exists as diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell.

  1. Identify the element X. How many valence electrons does it have?
  2. Draw the electron dot structure of the diatomic molecule of X. What type of bond is formed in it?
  3. Draw the electron dot structure for ammonia and what type of bond is formed in it?

How are elements grouped into various families in the periodic table?


Identify the following:

An element in Period 1 which can be placed in both Group 1 and Group 17 of the Periodic Table.


Element 'X' forms an oxide with the formula X2O3 which is a solid with high melting point. ‘X’ would most likely be placed in the group of the Periodic Table as:


Justify. Element 'X' forms an oxide with the formula X2O3 which is a solid with a high melting point. ‘X’ would most likely be placed in the group of the Periodic Table as Al.


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