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An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.

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प्रश्न

An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.

संक्षेप में उत्तर
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उत्तर

  1. Atoms with no electron will have mass, because mass depends on number of Protons and Neutrons though it has no electron.
  2. Atoms can exist without electrons, Matter is build out of neutrons, protons (+) and electrons (-). Matter becomes stable only if it is electrically neutral.
  3. So atoms without electrons do exist and must have their own states (charged or uncharged transfered back and forth in their environment)
  4. Example: He2+. It has 2 protons and 2 neutrons but no electrons.
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अध्याय 4: Atomic Structure - Evaluation [पृष्ठ ५२]

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सामाचीर कलवी Science - Term 1 [English] Class 7 TN Board
अध्याय 4 Atomic Structure
Evaluation | Q X. 1. | पृष्ठ ५२

संबंधित प्रश्न

ANSWER IN DETAIL

How are isobars different from isotopes ?


Write the names of the elements present in the following compound.

Common salt


Write the names of the elements present in the:- 

Ammonia


Who originated the word ‘atom’ ?


Name the particle or particles you would expect to find in :

The orbit of an atom


A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

Does the particle have an excess of electrons or a deficiency of electrons ?


Fill in the blank

A charged particle is called an _____


Name the three subatomic particles present in an atom.


How many times is a proton heavier than an electron?


Is it possible to see atoms these days ? Explain your answer.


An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?


Draw diagrams representing the atomic structures of the following:

  1. Sodium atom
  2. Chlorine ion
  3. Carbon atom
  4. Oxygen ion

The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of phosphorus


The smallest particle of matter that can exist by itself is ______.


The smaller particles found in the atom is called ______.


Draw the structure of an atom and explain the position of the sub-atomic particles.


Define the following term with an example.

Compound


______ is the smallest particle of an element.


Atoms of one element can be transmuted into atoms of other elements by ______


Give the salient features of “Modern atomic theory”.


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