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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Define Covalent Bond - Chemistry

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प्रश्न

Define: Covalent bond

परिभाषा

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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अध्याय 4: Atoms, Molecules and Radicals - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 4 Atoms, Molecules and Radicals
Additional questions | Q 12.2

संबंधित प्रश्न

Tick the most appropriate answer.

Who discovered that radioactive rays are given out by uranium?

  1. Henri Becquerel
  2. Marie Curie
  3. Pierre Curie
  4. Schmidt

ANSWER IN DETAIL

Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?


Define:- Molecule


Write the names of the elements present in the:-

Sodium hydroxide


Define: Relative atomic mass


Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.


Fill in the blank

If an atom gains an electron, it is called an _______


Fill in the blank

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


Write the full form of IUPAC.


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?


Give brief information of three subatomic particles with reference to electrical charge, mass and location.


Give scientific reason.

All the mass of an atom is concentrated in the nucleus.


Draw diagrams representing the atomic structures of the following:

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

Elements X and Y have 1 and 7 electrons in their outermost shell respectively.

What will be the charge present of the molecule XY after chemical combination?


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


Define the following term with an example.

Element 


In the nucleus of `""_20"Ca"^40`, there are ______


Does the solubility of a substance change with temperature? Explain with the help of an example.


Dalton’s atomic theory successfully explained

(i) Law of conservation of mass

(ii) Law of constant composition

(iii) Law of radioactivity

(iv) Law of multiple proportions


What is the fundamental particle of an element?


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