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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Define Chemical Bond - Chemistry

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प्रश्न

Define: Chemical bond

व्याख्या

उत्तर

Chemical bond— A chemical bond is the binding force between two or more atoms of a molecule.

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पाठ 4: Atoms, Molecules and Radicals - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 4 Atoms, Molecules and Radicals
Additional questions | Q 1.2

संबंधित प्रश्‍न

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 :- 

Sulphuric acid


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


 Fill in the blank:

Atoms are _____


Name three non-metals/radicals which have valency -1, -2, and -3.


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


How many times is a proton heavier than an electron?


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?


For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.


Which has more atoms, 50 g of aluminium or 50 g of iron ? Illustrate your answer with the help of calculations.

(Atomic masses : Al = 27 u ; Fe = 25 u)


The electron shell ______ is nearest to the nucleus.


Draw the basic structure of an atom representing its –

  1. Subatomic particles
  2. Nucleus
  3. Orbits or shells.

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


Rewrite the given sentence in correct form.

Elements contain two or more kind of atoms and compounds contain only one kind of atom.


In all atoms of an element


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


1 mole of Gold and Silver contain same number of atoms.


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


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