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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Define Covalent Bond

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प्रश्न

Define: Covalent bond

व्याख्या
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उत्तर

Covalent bond— When atoms of different non-metals neither donate nor accept electrons and hence no ions are formed, such a bond is called covalent bond.

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पाठ 4: Atomic Structure - Additional questions

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एस.पी. सिंह Concise Chemistry [English] Class 7 ICSE
पाठ 4 Atomic Structure
Additional questions | Q 12.2

संबंधित प्रश्‍न

Why is it not possible to see an atom with naked eyes?


MATCH THE COLUMNAS

1. Jpham  Dalton a. Neutrons
2. Atom b. Model of the atom
3. Chadwick c.The atomic theory of matter 
4. Rutherfrod d. Positively  charged 
5. Protons e. Electricity neutral 
6. Nuclear  fusion  f. Generator of electricity 
7.Gamma -rays  g. High penetrating power 
  h.Energy in sun 

TRUE \ FALSE

Elements having a tendency to accept electrons are called metals

 


Define:- Molecule


Write the names of `("NH"_4)_2"SO"_4` compounds:


Define: Ions


What are orbits or shells ?


Fill in the blank

If an atom loses an electron, it acquires ______ a charge.


Name the three subatomic particles present in an atom.


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?


Define the following term:

Atom


Define the following term with an example.

Element 


Assertion: An atom is electrically neutral.

Reason: Atoms have equal number of protons and electrons.


Define the following term with an example.

Compound


Define the following term with an example.

Metal


Define the following term with an example.

Metalloid


In all atoms of an element


Define the term ions or radicals.


An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.


What is the fundamental particle of an element?


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