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

The size of an atom is indicated by its ______.

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प्रश्न

The size of an atom is indicated by its ______.

पर्याय

  • atomic number

  • radius

  • number of shells

  • atomic mass

MCQ
रिकाम्या जागा भरा
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उत्तर

The size of an atom is indicated by its radius.

Explanation:

The size of an atom is defined by its atomic radius, which is the distance from the center of the nucleus to the outermost shell of electrons. While the number of shells influences the size, the physical dimension itself is specifically measured and referred to as the radius.

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पाठ 2: Periodic Classication of Element - Choose the correct option.

संबंधित प्रश्‍न

Answer the following in respect of element `31/15 P`

Give its electronic configuration


Why is the size of neon greater than fluorine?


Write the name and symbol of the element from the description.

The atom having the smallest size.


Write the name and symbol of the element from the description.

The atom having the smallest atomic mass.


Write a scientific reason.

Atomic radius goes on increasing down a group.


Select the correct answer
Atomic radii of fluorine and neon in angstrom unit are


Supply the missing word from those in the brackets:
If an element has seven electrons in its outermost shell then it is likely to have the ______ (largest/ smallest) atomic size among all the elements in the same period.


The changes in the properties of elements on moving from left to right across a period of the Periodic Table. For the property, choose the correct answer. 

The atomic size:


_______ is the distance between the nucleus of the atom and its outermost shell.


Atomic radius is expressed in the unit ______.


While going from top to bottom in a group the atomic radius ______.


Some elements and their atomic radii are given here. Arrange them in decreasing order of their atomic radii. Identify which of the above elements is the biggest atom and which is smallest?

Element K Na Rb Cs Li
Atomic radius (pm) 231 186 244 262 151

Write information about the given atomic numbers in the table. 10, 20, 7.

Atomic Number Electronic configuration Group Period Element
10        
20        
7        

The electronic configuration of metal A is 2, 8, 18, 1.

The metal A when exposed to air and moisture forms B a green layered compound. A with con. H2 SO4 forms C and D along with water. D is a gaseous compound. Find A, B, C, and D.


Carbon belongs to the second period and Group 14. Silicon belongs to the third period and Group 14. If the atomic number of carbon is 6, the atomic number of silicon is ______


An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?


Which of the following are the characteristics of isotopes of an element?

  1. Isotopes of an element have same atomic masses
  2. Isotopes of an element have same atomic number
  3.  Isotopes of an element show same physical properties
  4. Isotopes of an element show same chemical properties

  1. In below ladder symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the Periodic Table.
  2. Arrange them in the order of their group also.


  1. Electropositive nature of the element(s) increases down the group and decreases across the period
  2. Electronegativity of the element decreases down the group and increases across the period
  3. Atomic size increases down the group and decreases across a period (left to right)
  4. Metallic character increases down the group and decreases across a period.

On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

  1. Name the most electropositive element among them
  2. Name the most electronegative element
  3. Name the element with smallest atomic size
  4. Name the element which is a metalloid
  5. Name the element which shows maximum valency.

Arrange the following as per instruction given in the bracket.

Mg, Cl, Na, S, Si (decreasing order of atomic size)


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