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15 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is a atom
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small particle with chemical properties and has no charge
number of electrons(in shells) is equal to protons |
contains protons and neutrons
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what is an atomic number
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the number of protons in the nucleus
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example: 1Hydrogen
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Number of + and -
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NUMBER of protons(+)positive will equal to number
of electrons (negative)(-) |
+ -
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summary
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atomic number p+
mass number p+ Neutrons therefore no. of neutrons= mass number - atomic |
i.e: (p++n)-(p+)
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5 pysical properties of element
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colour, melting, boiling points, density and hardness
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properties
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what is eka-silicon?
look like |
eka-silicon is known as germanium
silicon light green |
(GC)
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WHAT ARE THE GROUPS?
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vERTICAL Columns
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vertical columns are called periods
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names of metalloids
symbols of non-metals |
b, si, c
BR, I, HE, C, N, P, OXGYEN |
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are transition metals
trasition elements are in period 3- |
true
Uus, Uuo sodium, magnesium, aluminium |
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roman numerals
Group VI- potassium, calcium and oxygen |
IV=4
II=7 I=2 V=5 |
oxygen
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NUMBER OF ELECTRONS
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NUMBER OF ELECTRONS(SHELLS)
ARE EQUAL TO PROTONS |
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rule
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1st shell maximium number of e- = 2
2nd shell = 8 3rd shell = 8 |
eg: 1H in txt form 1 electron
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ions
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neutral electrically cause no. of + equals no. e-, balancing is changed then atom becomes charged it is called an ion.
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atom loss e it become + ion
atom gains e it becomes - ion |
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Group VIII
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contains the noble or insert gases. noble gases that rarely react r stable
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helium have outer shells filled with 2 e, while ne, ar,kr, and Rn have 8 outer shell a stable arrangment.
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what group and period would these atoms be in?
2,8,7 2,5 |
he, o, n
he, b |
groups, electrons and periods
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