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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: 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 12.2

संबंधित प्रश्‍न

TRUE \ FALSE

Elements combine in definite proportions to form compounds.


TRUE \ FALSE

Neils Bohr gave the theory to explain the arrangement of protons in an atom.


Write the names of the elements present in the:- 

Glucose


Write the names of the elements present in the:-

Acetic acid


Write the names of `"Na"_3"PO"_4` compounds :


What does the word ‘atom’ mean?


An atom has 13 protons and 14 neutrons.

What is the atomic number of the atom ?


Define: 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

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


Fill in the blank

A charged particle is called an _____


Fill in the blank

An _______ is electrically neutral.


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?


An atom of an element X may be written as `""_9^4"X"`
(a) What does the figure 9 indicate?
(b) What does the figure 4 indicate?
(c) What is the number of protons in atom X?
(d) What is the number of neutrons in atom X?
(e) What is the number of electrons in atom X?
(f) How many electrons are there in the outermost shell of an atom of element X?
(g) Write the symbol of ion formed by an atom of element X.


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


Find the mass of 2 moles of nitrogen atoms.


Give scientific reason.

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


Draw the diagrams representing the atomic structures of the following: Neon


Select the correct answer to the statement given below:

The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.


The ______ are combination of atoms of various elements or the same element.


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