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What is the entire universe made up of? - PowerPoint PPT Presentation


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What is the entire universe made up of?. Rh. Fr. Ra. Ac. Rf. Db. Sg. Bh. Hs. Mt. Ds. Rg. ?. ?. ?. ?. ?. ?. ?. Cs. Ba. Tc. Ru. Ta. W. Re. Os. Ir. Pt. Au. Hg. Tl. Pb. Bi. Po. At. Rn. Rb. Sr. Y. Zr. Nb. Mo. La. Hf. He. Ge. Ag. Cd. In. Sn. Sb.

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Presentation Transcript
slide1

What is the

entire universe

made up of?

the periodic table of elements

Rh

Fr

Ra

Ac

Rf

Db

Sg

Bh

Hs

Mt

Ds

Rg

?

?

?

?

?

?

?

Cs

Ba

Tc

Ru

Ta

W

Re

Os

Ir

Pt

Au

Hg

Tl

Pb

Bi

Po

At

Rn

Rb

Sr

Y

Zr

Nb

Mo

La

Hf

He

Ge

Ag

Cd

In

Sn

Sb

Te

I

Xe

K

Ca

Sc

Ti

V

Cr

Mn

Fe

Co

Ni

Cu

Zn

H

Pd

As

Se

Br

Kr

Na

Mg

Al

Si

P

S

Cl

Ar

Li

Be

B

C

N

O

F

Ne

Ga

The periodic table of elements
slide14

John Dalton (1766–1844)

  • An English chemist who revived the ancient Greek’s idea of matter and proposed:
  • “All matter is made up of atoms. Atoms are the smallest particles of matter and cannot be broken down into smaller units”
slide15

Joseph Thomson (1856–1940)

  • A British physicist who discovered and experimented with cathode rays. It was found that these rays consisted of what are later called electrons by Thomson.
  • “An atom is a ball of positive charge with electrons dotted evenly through it like currants in a plum pudding. Overall, the atom is neutral”
slide18

Ernest Rutherford (1871-1937)

  • This New Zealand physicist attempted to prove Thomson’s model of the atom was correct and designed an experiment.
  • However…
slide20

Only a few atoms thick Gold foil

Screen

Tiny, positive alpha particles

slide24

James Chadwick (1891-1974)

  • In 1932, he performed an experiment to discover the third type of sub-atomic particle that is not deflected by an electric or magnetic field – the “neutron”.
slide26

Atomic Structure today (or yesterday)

  • Nucleus is made up of protons and neutrons which are bound together by nuclear force.
  • Protons and neutrons are callednucleons.
  • Nucleus is very small compare to the size of the whole atom but has 99.95% of the mass.
  • Electrons move around the nucleus in an unknown way.