The document discusses the basic concepts of chemistry and the composition of matter. It explains that all matter is made up of chemical elements, which can exist in solid, liquid, or gas states. The human body contains 26 main elements that are classified into major elements, minor elements, and trace elements. Major elements like oxygen, carbon, hydrogen, and nitrogen make up 96% of body mass, while minor elements like calcium and phosphorus make up 3.8%. The remaining 0.2% consists of trace elements that have important functions, though some of their functions remain unknown.

1. BY, MS.PRIYANKA GOHIL
M.Sc. (N) OBG,
PhD Scholar,
MBNC

2. Chemistry is the science of the structure
and interaction of matter.
It is anything that occupies space and has
mass.
The force of gravity acting on matter, does
change. When objects are farther from
Earth, the pull of gravity is weaker, thus
the astronaut has weight close to zero in
outer space.

3. 1. SOLID
2. LIQUID
3. GAS

4. Such as bones and teeth, are compact
and have definite shape and volume.
Such as blood plasma, have a definite
volume and assume the shape of their
container.
Like oxygen and carbon dioxide, have
neither a definite shape nor volume.

5. All forms of matter (living or non-living)
are made up a limiting number of building
blocks called chemical elements.
An element cannot be split into a simpler
substance by ordinary chemical means.
Scientist now recognized 114 elements, of
which 92 occur naturally on Earth (the
rest have been produced artificially from
natural elements).

6. Each element is designated by a chemical
symbol (one or two letters)...
H for hydroge
C for carbon
O for oxygen
N for nitrogen
Ca for calcium
Na for sodium (Nitrium = sodium)

7. Human body is made up of normally 26
different elements, which can be
classified in three varities.

8. MAJOR
ELEMENTS
MINOR
ELEMENTS
TRACE
ELEMENTS

9. These just four elements constitute about
96% of body mass: Oxygen, carbon,
hydrogen and nitrogen.
These are 8 elements, which constitute
3.8% of body mass: calcium, phosphorus,
potassium, sulphur, sodium, chlorine,
magnesium and iron.

10. These 14 elements are present in tiny
amounts and account for the remaining
0.2% of the body mass.
Several trace elements have important
functions in the body such as iodine (I) is
needed to make thyroid hormones.
The function of some trace elements are
unknown.