The document discusses the formation of elements in stars and the early universe. It explains that during the Big Bang, the first elements hydrogen and helium were formed in a ratio of 75% to 25% that is seen today. Heavier elements from helium up to iron are formed through nuclear fusion at the extremely high temperatures and pressures in the cores of stars. Towards the end of their life cycles, stars undergo gravitational collapse, which further increases temperature and pressure and allows for the formation of even heavier elements through fusion.

1. PHYSICAL SCIENCE
Month of January
Objectives:
Give evidence for and describe the
formation of heavier elements during star
formation and evolution
Explain how the concept of atomic number
led to the synthesis of new elements in the
laboratory

8. As the big bang expand and cooled
there is formation of the nuclei
produces the first elements in the
universe

9. 75%- hydrogen
25%-helium
 This shows the same ratio of hydrogen and
helium seen today in our universe.
 Serve as key evidence happened in big bang
 Key point were elements were formed in the
universe

10. The light elements
includes Hydrogen (H),
Deuterium (H²) ,
Helium-3, Helium-4
and Lithium-7

14. Take place in the process of fusion
in the center of a star
The star is responsible in all the
formation of elements from He to
Fe

18. The process:
 Yellow star uses the elements H
& He to fuel fusion.
 At the center of star there is
enough High temperature and
enough force to put/ stick
together.

19. The process:
 Yellow star uses all the available
H & He in its core and
eventually collapse on itself
which cause an increase in
temperature and afterwhich is
the increase in pressure