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15 Cards in this Set

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  • Back
  • 3rd side (hint)
What is a atom
small particle with chemical properties and has no charge
number of electrons(in shells) is equal to protons
contains protons and neutrons
what is an atomic number
the number of protons in the nucleus
example: 1Hydrogen
Number of + and -
NUMBER of protons(+)positive will equal to number
of electrons (negative)(-)
+ -
summary
atomic number p+
mass number p+ Neutrons
therefore no. of neutrons= mass number - atomic
i.e: (p++n)-(p+)
5 pysical properties of element
colour, melting, boiling points, density and hardness
properties
what is eka-silicon?
look like
eka-silicon is known as germanium
silicon light green
(GC)
WHAT ARE THE GROUPS?
vERTICAL Columns
vertical columns are called periods
names of metalloids
symbols of non-metals
b, si, c
BR, I, HE, C, N, P, OXGYEN
are transition metals
trasition elements
are in period 3-
true
Uus, Uuo
sodium, magnesium, aluminium

roman numerals
Group VI- potassium, calcium and oxygen
IV=4
II=7
I=2
V=5
oxygen
NUMBER OF ELECTRONS
NUMBER OF ELECTRONS(SHELLS)
ARE EQUAL TO PROTONS
rule
1st shell maximium number of e- = 2
2nd shell = 8
3rd shell = 8
eg: 1H in txt form 1 electron
ions
neutral electrically cause no. of + equals no. e-, balancing is changed then atom becomes charged it is called an ion.
atom loss e it become + ion
atom gains e it becomes - ion
Group VIII
contains the noble or insert gases. noble gases that rarely react r stable
helium have outer shells filled with 2 e, while ne, ar,kr, and Rn have 8 outer shell a stable arrangment.
what group and period would these atoms be in?
2,8,7
2,5
he, o, n
he, b
groups, electrons and periods