# পদার্থ বিজ্ঞান ও রসায়ন

Common to Physics and Chemistry

1. Structure of Atom

Concept of atom, Dalton's atomic theory (critical study not required).

Nucleus and extranuclear electrons. Structure of nucleus-constituents (protons and neutrons only). Simple mention of nuclear force.

Mass and charge of electron, proton, neutron.

Planetary model of atom- similarities and dissimilarities with solar systems.

Distribution of electrons in K,L,M,N, shell; Electronic configuration up to Calcium.

Atomic number and mass number

Atomic mass (based on $${}^{12}C = 12.00000$$

Nuclide (an atom with a particular atomic number and mass number).   Isotopes (Definition)-lsotopes oL hydrogen, oxygen, carbon, chlorine.   Isotopes have similar chemical properties. Ions—definition with example.

2. Properties of gases pressure and temperature

Boyle's Law : Statement and explanation with mathematical expression.

Charles' Law: Statement and explanation with mathematical expression.

Concept of Kelvin (absolute) temperature. Kelvin Scale-relationship with Celsius scale. Charles' Law in terms of Kelvin temperature. Standard temperature and pressure (STP).

Combined Charles' Law and Boyle's Law PV/T = constant.

Simple numerical problems. Brief mention of the motion of gas molecules and dependence of pressure and    temperature on such motion (very elementary non-mathematical discussion).

Concept of molecules.

Statement and explanation of Avogadro's Law.

Molecular mass based on  $${}^{12}C = 12.00000$$.

Gram atomic mass and gram molecular mass.

Molar volume.

Statement of deductions from Avogadro's Law (deduction not required) :

Molecules  of common  elementary gases  like Avogadro number (definition with explanation).

Mole-Unit of amount of substance.

4. Simple weight-weight  calculations using chemical equation

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## Related Items

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Chemistry

1.Periodic table

A   Periodicity of properties of elements.

Mendeleef's periodic law.

Modified Mendeleef's periodic law.

Periodic table based on modified periodic law (atomic number)

Physics