5. Inside the Atom

5. Inside the Atom

​By :- Aarushi Patil

Open Ended

What is meant by matter?

Open Ended

What is an Atom ?

Open Ended

What is the smallest unit of matter ?

​Lets recap

• ​Matter is Made up of molecules.

• ​Molecules are formed from atom.

• ​Atom is the smallest unit of matter.

​Dalton's Atomic Theory

• ​British Scientist John Dalton put forth in 1803 A.D. his celebrated 'Atomic Theory '.

• ​He says that matter is made up of atoms.

• We cannot divide or destroy the Atom.

• According to his theory the mass is divided into atom.

​J.J. Thomson

• The plum pudding model of atom put forth by Thomson in the year 1904.

• This was the first model of Atomic structure.​

• ​He named the negatively charged particles as electrons.

• ​his says that the positive charged is distributed throughout the atom and negative charged particles are embedded in it.

Multiple Choice

Negatively charged particles are known as

• protons

• Electrically neutral

• electrons

​Thank You !!