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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

What Does an Atom Consist of ? Explain.

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प्रश्न

What does an atom consist of ? Explain.

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उत्तर

An atom consists protons, electrons and neutrons. Protons are positively charged, electrons have negative charge while neutrons have no charge

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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 2

संबंधित प्रश्‍न

If bromine atom is available in the form of, say, two isotopes `""_35^79Br (49.7%)" and """_35^81Br (50.3%)`, calculate the average atomic mass of bromine atom.


ANSWER IN DETAIL

State the postulates of the Dalton’s atomic theory.


Write the names of the elements present in the :- 

Sulphuric acid


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

The nucleus of an atom


An atom has 13 protons and 14 neutrons.

How many electrons would be present in this atom ?


Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for 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?


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)


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.


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 ______.


State true or false. If false, correct the statement.

An atom is electrically neutral.


Define – Atom.


Name the sub-atomic particles.


The volume occupied by 1 mole of a diatomic gas at S.T.P is ______


A change in the physical state can be brought about


The smallest unit of an element is ______.


What are the 3 most abundant atoms on the earth?


Atoms have a radius of the order ______.


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