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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

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.

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प्रश्न

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.

विकल्प

  • Molecule

  • Orbits

  • Atom

  • Valency

  • Radical

MCQ
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उत्तर

Molecule

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अध्याय 4: Atomic Structure - Objective Type Questions

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विराफ जे दलाल Simplified Middle School Chemistry [English] Class 7 ICSE
अध्याय 4 Atomic Structure
Objective Type Questions | Q 2.2

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.


TRUE \ FALSE

Elements combine in definite proportions to form compounds.


ANSWER IN DETAIL

How are isobars different from isotopes ?


Define:- Molecule


Write the names of the elements present in the:-

Sodium hydroxide


Define: Ions


Define: Mass number


A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

What is the mass number of X?


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.


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?


The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.


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.


Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.


Electron, proton, neutron are the types of ______ in an atom.


Rewrite the given sentence in correct form.

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


Define the following term with an example.

Non-metal


Which of the following statements made by Dalton has not undergone any change?


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