# Balbharati solutions for General Science 8th Standard Maharashtra State Board chapter 5 - Inside the Atom [Latest edition]

## Chapter 5: Inside the Atom

Exercise
Exercise [Page 38]

### Balbharati solutions for General Science 8th Standard Maharashtra State Board Chapter 5 Inside the Atom Exercise [Page 38]

Exercise | Q 1.1 | Page 38

What is the difference in the atomic models of Thomson and Rutherford?

Exercise | Q 1.2 | Page 38

What is meant by valency of an element? what is the relationship between the number of valence electron and valency?

Exercise | Q 1.3 | Page 38

What is meant by atomic mass number? Explain how the atomic number and mass number of carbon are 6 and 12 respectively.

Exercise | Q 1.4 | Page 38

What is meant by subatomic particle? give brief information of three subatomic particles with reference to electrical charge, mass and location.

Exercise | Q 2.1 | Page 38

Give scientific reason.

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

Exercise | Q 2.2 | Page 38

Give scientific reason.

Atom is electrically neutral.

Exercise | Q 2.3 | Page 38

Give scientific reason.

Atomic mass number is a whole number.

Exercise | Q 2.4 | Page 38

Give scientific reason.

Atoms are stable though negatively charged electron is revolving within it.

Exercise | Q 3.1 | Page 38

Define the following form:

Atom

Exercise | Q 3.2 | Page 38

Define the following form :

Isotope

Exercise | Q 3.3 | Page 38

Define the following form:

Atomic number

Exercise | Q 3.4 | Page 38

Define the following form :

Atomic mass number

Exercise | Q 3.5 | Page 38

Define the following form :

Moderator in nuclear reactor

Exercise | Q 4.1 | Page 38

Draw a neat labelled diagram

Rutherford's scattering experiment

Exercise | Q 4.2 | Page 38

Draw a neat labelled diagram

Thomson's atomic model

Exercise | Q 4.3 | Page 38

Draw a neat labelled diagram

Diagramatic sketch of electronic configurations of magnesium  (Atomic number 12)

Exercise | Q 4.4 | Page 38

Draw a neat labelled diagram

Diagramatic sketch of electronic configuration of Argon (Atomic number 18)

Exercise | Q 5.1 | Page 38

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

Exercise | Q 5.2 | Page 38

An electron carries a ________ charge.

Exercise | Q 5.3 | Page 38

The electron shell _________ is nearest to the nucleus.

Exercise | Q 5.4 | Page 38

The electronic configuration magnesium is 2, 8, 2. From this it is understood that the valence shell of magnesium is ___________.

Exercise | Q 5.5 | Page 38

The valency of hydrogen is 'one as per the molecular formula H2O. Therefore valency of 'Fe' turns out to be ______________ as per the formula Fe2O3

Exercise | Q 6 | Page 38

Match the pairs.

 Group 'A' Group 'B' a. Proton i. Negatively charged b. Electron 2. Neutral c. Neutron 3. Positively charged
Exercise | Q 7 | Page 38

Deduce from the datum provided.

 Datum To deduce ""_11^23Na Neutron number ""_6^14C Mass number ""_17^37 Cl Proton number

Exercise

## Balbharati solutions for General Science 8th Standard Maharashtra State Board chapter 5 - Inside the Atom

Balbharati solutions for General Science 8th Standard Maharashtra State Board chapter 5 (Inside the Atom) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Maharashtra State Board General Science 8th Standard Maharashtra State Board solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in General Science 8th Standard Maharashtra State Board chapter 5 Inside the Atom are Structure of an Atom, Discovery of Charged Particles in Matter, Nucleus, Protons (p), Neutrons (n), Electrons (e), Atomic Mass, Atomic Number (Z), Mass Number (A), and Number of Neutrons (n), Electronic Configuration of Atom, Electronic Configuration of Atoms, Valency, Isotopes, Nuclear Reactor, J. J. Thomson’s Atomic model, Lord Rutherford’s Atomic model, Neils Bohr’s Model of an Atom, Atoms: Building Blocks of Matter, History of Atom, Dalton’s atomic theory.

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