मराठी
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 ______. - Science and Technology 1

Advertisements
Advertisements

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
रिकाम्या जागा भरा
Advertisements

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.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 2: Periodic Classification of Element - Exercises [पृष्ठ २८]

संबंधित प्रश्‍न

An element P (atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following questions giving reason:

Write the position of P and Q in the Modern Periodic Table and the molecular formula of the compound formed when P reacts with Q.


Rewrite the following statement after correction, if necessary:

Periods are the horizontal rows of elements.


An element X is in group 2 of the periodic table what will be the formula of its oxide?


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.


A metal X is in the first group of the periodic table. What will be the formula of its oxide?


Find the neutral atom in the periodic table which has the same number of electrons as K+ and Cl. What is this number?


Two elements X and Y belong to group 1 and 2 respectively in the same period of periodic table. Compare them with respect to:

(i) the number of valence electrons in their atoms

(ii) their valencies

(iii) metallic character

(iv) the sizes of their atoms

(v) the formulae of their oxides

(vi) the formulae of their chlorides


(a) How is possible valency of an element determined from the electronic configuration of its atom ?

(b) Determine the valency of an element X whose atomic number is 15. 


What is the need for classification of elements?


How did the early chemists classify elements?


Example for liquid metal is ______.


Among the given species A–, A+, and A, the smallest one in size is ______.


Identify the bond between H and F in the HF molecules.


What property forms the basis of identification?


An element X combines with oxygen to form an oxide XO. This oxide is electrically conducting. Write the formula of the compound formed when X reacts with chlorine.


Consider the following elements 20Ca, 8Or 18Ar, 16S, 4Be, 2He
Which of the above elements would you expect to be in group 16 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


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


The atomic number of an element 'X' is 11.

  1. Write the electronic configuration of X and find its valency.
  2. Write the formula and nature of its oxide.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×