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Choose the Correct Answer from the Option Given Below. Modern Atomic Symbols Are Based on the Method Proposed by - Chemistry

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प्रश्न

Choose the correct answer from the option given below.

Modern atomic symbols are based on the method proposed by

विकल्प

  • Bohr

  • Dalton

  •  Berzelius

  • Alchemist 

MCQ
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उत्तर

Berzelius

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 1: The Language of Chemistry - Exercise 1 (C) [पृष्ठ १९]

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सेलिना Concise Chemistry [English] Class 9 ICSE
अध्याय 1 The Language of Chemistry
Exercise 1 (C) | Q 10.1 | पृष्ठ १९

संबंधित प्रश्न

Define the atomic mass unit.


An ion with mass number 56 contains 3 units of positive charge and 30.4% more neutrons than electrons. Assign the symbol to this ion.


How many atoms are present in one gram atomic mass of a substance ?


Define atomic mass of an element.


Explain the need for a reference atom for atomic mass. Give some information about two reference atoms.


What is meant by Unified Atomic Mass?


Define the following form:

Atomic mass number


Explain the following:

An element has atoms with different mass numbers.  


Name or state the following:

Atoms of the same element differing in mass number


Ordinary chlorine gas has two isotopes \[\ce{^35_17Cl}\] and \[\ce{^37_17Cl}\] in the ratio of 3 : 1. Calculate the relative atomic mass of chlorine.


Give a reason for the following:

The mass number of an atom is slightly less than the actual atomic mass.


The sum of the numbers of protons and neutrons of an atom is called its ______


The gram atomic mass of an element has no unit.


Write the different types of isotopes of oxygen and their percentage abundance.


Calculate the % of each element in calcium carbonate. (Atomic mass: C-12, O-16, Ca -40)


Calculate the % of oxygen in Al2(SO4)3. (Atomic mass: Al-27, O-16, S -32)


One electron is present in the outermost shell of the atom of an element X. What would be the nature and value of charge on the ion formed if this electron is removed from the outermost shell?


Chlorine exists in two isotopic forms, \[\ce{Cl-37}\] and \[\ce{Cl-35}\] but its atomic mass is 35.5. This indicates the ratio of \[\ce{Cl-37}\] and \[\ce{Cl-35}\] is approximately


An atom having atomic mass number 13 has 7 neutrons. What is the atomic number of the atom?


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