Back to Course

SS3: PHYSICS - 2ND TERM

0% Complete
0/0 Steps
  1. Magnetic Field | Week 1
    4 Topics
  2. Electromagnetic Field
    4 Topics
  3. Electromagnetic Induction
    6 Topics
  4. The Transformer
    5 Topics
  5. Simple A.C Circuit
    4 Topics
  6. Models of the Atom
    2 Topics
  7. Radioactivity
    3 Topics
  8. Half Life
    8 Topics
  9. Energy Quantization
    3 Topics
  10. Photoelectric Effect
    4 Topics
  11. Wave Particle Paradox
    3 Topics



  • Do you like this content?

  • Follow us

Lesson Progress
0% Complete

An atom consists of a central small nucleus which contains the proton and the neutron and is surrounded by electrons in an orbit. There is an electrostatic force of attraction between the positively charged nucleus and the negatively charged electrons. The maximum number of electrons a shell can accommodate is given by 2n2, n is an integer

n = 1,   2 x 12  = 2

n = 2,   2 x 22 = 8

n = 3,   2 x 32 = 18

An atom is represented by the symbol where A – mass number, Z – atomic number 

Atomic number of an atom is the number of protons in the nucleus of an a atom.

The mass number is the number of protons and neutrons in the nucleus of an atom 

The number of neutrons, N = A-Z,  

The proton is positively charged, the neutron has no charge but the electron is negatively charged 

Responses

Your email address will not be published.

back-to-top
error: