Download Question 6

Welcome
Dr. Mohammad Nurul Hoque
Senior Lecturer
Department of Science
English Version
Cambrian School & college
The evolution of atom and structure,
Atomic & Mass Number
Chapter: SIX Lesson:1-6
TOPICS
The evolution of atom and structure, Atomic & Mass Number.
Lesson Outcome
After this lesson students will able to…
 Say what atom
 Atomic number, mass number
 Explain the structure of atom
Important words
1. Atomos
2. Concentrated
3. John Dalton
Democritus Idea
Tiny particles
Matter
These particles can not be divisible called atom
Aristotle and Pluto’s opinion
Matters can be divisible
Rutherford’s Experiment
-
Empty
Positively Charged
Or Neucleus
++
-
Negatively charged
Or Electron
Neils Bohr’s Idea
Orbit
Empty
-
Positively Charged
Or Neucleus
++
-
Negatively charged
Or Electron
Class Work
Draw a model of an atom and
identify it’s corpuscular.
Feedback
1. What is atom?
2. Who was Democritus?
3. What is the Dalton’s idea about atom?
Home Work
Question 1: What is atom?
Question 2: What is molecule?
Question 3: What are the particles of an atom?
Question 4: What is atomic number?
Question 5: What is mass number? Write with example.
Question 6: Explain carbon isotope.
Question 7: Ne and Ar elements are stable- explain.
Question 8: What does it mean by nucleus of an atom?
Question 9: Why most of the mass of an atom concentrated at
nucleus?
Question 10: Explain how many electron can stay in the 4th energy
level.
Thank YOU