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![Viraf J. Dalal solutions for New Simplified Middle School Chemistry [English] Class 7 chapter 4 - Atomic Structure - Shaalaa.com](/images/new-simplified-middle-school-chemistry-english-class-7_6:b84cc9da981046be846d272ceba65ef2.jpg "Viraf J. Dalal solutions for New Simplified Middle School Chemistry [English] Class 7 chapter 4 - Atomic Structure")
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Solutions for Chapter 4: Atomic Structure
Below listed, you can find solutions for Chapter 4 of CISCE Viraf J. Dalal for New Simplified Middle School Chemistry [English] Class 7.
Viraf J. Dalal solutions for New Simplified Middle School Chemistry [English] Class 7 4 Atomic Structure Exercise
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
State the main points of the contradiction of Dalton’s atomic theory by the Modern Atomic Theory.
‘Atoms of the same element or different from Dalton’s atomic theory by the Modern Atomic Theory.
Give two examples each of –
- Atoms of the same element
- Atoms of different elements combining to form a molecule.
Explain the term ‘atomicity’.
Give a reason why –
Helium is considered monoatomic, but hydrogen a diatomic molecule.
Give a reason why –
Ozone is considered triatomic, but phosphorus a tetratomic molecule.
State the atomicity of the following:
Neon
State the atomicity of the following:
Oxygen
State the atomicity of the following:
Chlorine
State the atomicity of the following:
Argon
State the atomicity of the following:
Sulphur
A radical take part – unsplit in a chemical reaction and retains its identity in reactions.
With reference to the radical –
- ammonium
- bisulphate
- carbonate
state the group of atoms present in each radical.
Differentiate between the following with suitable examples- A basic radical and an acid radical
Name the cation and the anion in the salt – calcium sulphate
Explain the term ‘valency’.
State giving the reason the valency of –
Chlorine in hydrogen chloride
State giving the reason the valency of –
Sulphate in sulphuric acid
State giving the reason the valency of –
Nitrogen in ammonia
State giving the reason the valency of –
Magnesium in magnesium oxide
Give the symbol and valency of the following element and radical.
Potassium
Give the symbol and valency of the following element and radical.
Sodium
Give the symbol and valency of the following element and radical.
Hydrogen
Give the symbol and valency of the following element and radical.
Calcium
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Zinc
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the symbol and valency of the following element and radical.
Ammonium
Give the symbol and valency of the following element and radical.
Bicarbonate
Give the symbol and valency of the following element and radical.
Nitrate
Give the symbol and valency of the following element and radical.
Bisulphate
Give the symbol and valency of the following element and radical.
Bisulphite
Give the symbol and valency of the following element and radical.
Hydroxide
Give the symbol and valency of the following element and radical.
Carbonate
Give the symbol and valency of the following element and radical.
Sulphate
Give the symbol and valency of the following element and radical.
Sulphite
Give an example of three elements exhibiting variable valency.
State what is meant by the term chemical formula.
Give the chemical formula of sodium hydroxide
Give the chemical formula of sodium nitrate
Give the chemical formula of sodium bicarbonate
Give the chemical formula of sodium sulphite
Give the chemical formula of magnesium nitrate
Give the chemical formula of ammonium sulphate
Give the chemical formula of carbonic acid
Give the chemical formula of calcium phosphate
‘Dilute hydrochloric acid is added to sodium hydroxide’. Give a word equation and a molecular equation of the same. Is the equation written, a balanced equation. Give reasons.
State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.
Viraf J. Dalal solutions for New Simplified Middle School Chemistry [English] Class 7 4 Atomic Structure Objective Type Questions
Fill in the blank:
A molecule of an element is _________.
Fill in the blank:
A radical with one atom of sulphur and three atoms of oxygen are __________.
Fill in the blank:
An element with variable valency is _________.
Fill in the blank:
The formula of aluminium sulphate is _________.
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
Select the correct answer to the statement given below:
The basic unit of matter is not capable of independent existence.
Molecule
Orbits
Atom
Valency
Radical
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.
Molecule
Orbits
Atom
Valency
Radical
Select the correct answer to the statement given below:
An elementary particle of matter – of a group of atoms of different elements behaving as a single unit with charge on the group.
Molecule
Orbits
Atom
Valency
Radical
Select the correct answer to the statement given below:
Imaginary path around the nucleus of an atom in which electrons revolve.
Molecule
Orbits
Atom
Valency
Radical
Select the correct answer to the statement given below:
The term for the combining capacity of an element or the number of hydrogen atoms with which it combines or replaces.
Molecule
Orbits
Atom
Valency
Radical
Match the radicals in List I with their correct names from List II.
| List I | List II | |
| 1. `"NO"_3^(1-)` | A: Bisulphite | F: Sulphate |
| 2. `"HSO"_4^(1-)` | B: Phosphate | G: Nitrate |
| 3. `"SO"_4^(2-)` | C: Carbonate | H: Phosphite |
| 4. `"PO"_4^(3-)` | D: Nitrite | I: Sulpite |
| 5. `"HCO"_3^(1-)` | E: Bicarbonate | J: Bisulphate |
State the correct formula of the following from the option given:
Calcium hydroxide
\[\ce{Ca2OH}\]
\[\ce{Ca(OH)2}\]
\[\ce{CaOH}\]
State the correct formula of the following from the option given:
Sodium bisulphite
\[\ce{NaHSO4}\]
\[\ce{Na2HSO3}\]
\[\ce{NaHSO3}\]
State the correct formula of the following from the option given:
Ammonium sulphate
\[\ce{(NH4)2SO4}\]
\[\ce{NH4SO3}\]
\[\ce{(NH4)2SO3}\]
State the correct formula of the following from the option given:
Aluminium phosphate
\[\ce{Al2(PO4)3}\]
\[\ce{AlPO4}\]
\[\ce{Al2(PO4)2}\]
State the correct formula of the following from the option given:
Copper [II] nitrate
\[\ce{Cu(NO3)2}\]
\[\ce{Cu2NO3}\]
\[\ce{CuNO3}\]
Name the following:
A molecule of a compound containing two oxygen atoms and one nitrogen atom.
Name the following:
The radical containing one nitrogen and four hydrogen atoms.
Name the following:
The compound formed when iron [Fe2+] combines with oxygen [O2−].
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
Name the following:
A non-metal which forms a polyatomic molecule with more than three atoms.
Solutions for 4: Atomic Structure
Viraf J. Dalal solutions for New Simplified Middle School Chemistry [English] Class 7 chapter 4 - Atomic Structure
Shaalaa.com has the CISCE Mathematics New Simplified Middle School Chemistry [English] Class 7 CISCE solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. Viraf J. Dalal solutions for Mathematics New Simplified Middle School Chemistry [English] Class 7 CISCE 4 (Atomic Structure) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
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Concepts covered in New Simplified Middle School Chemistry [English] Class 7 chapter 4 Atomic Structure are Naming Chemical Compounds, Atoms: Building Blocks of Matter, Molecules, Dalton’s Atomic Theory, Classification of Molecules, Classification of Molecules, Molecular Formula of an Elements, Classification of Molecules, Ions (Radicals) and Its Types, Difference Between Atom, Molecules, and Radicals, Valency, Variable Valency, The Modern Periodic Table, Molecular Formula of Compounds, Chemical Formula or Molecular Formula.
Using Viraf J. Dalal New Simplified Middle School Chemistry [English] Class 7 solutions Atomic Structure exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in Viraf J. Dalal Solutions are essential questions that can be asked in the final exam. Maximum CISCE New Simplified Middle School Chemistry [English] Class 7 students prefer Viraf J. Dalal Textbook Solutions to score more in exams.
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