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Chemistry
C1
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Science > Chemistry > C1
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Science > Chemistry > C1
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1.1
Science > Chemistry > C1
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History Of the atom names
Science > Chemistry > C1
10 cards
Cards (92)
What is an
atom
?
An atom is the
smallest
part of an element (Can be
divisible
)
How are atoms represented
Chemical Symbols
How many elements are there?
Around
100
How are Compounds formed?
Chemical Reactions
What is a Chemical Reaction?
Formation
of one or more new substances through
energy
change
What are Compounds?
Substance containing
two
or more elements
They are always
chemically
combined
They always have
fixed
proportions
How can compounds be separated?
Chemical reactions
What is a mixture?
Two
(or more) Elements or
compounds
not chemically combined.
The
properties
of each substance is
unchanged
How can mixtures be separated?
Filtration
Crystallisation
Simple Distillation
Fractional Distillation
Chromatography
Describe the plum pudding model
Ball of
positive
charge with
electrons
embedded in it
What was concluded during the Alpha Particle Scattering experiment?
The
mass
of the atom was concentrated at the
centre
The nucleus was
positively
charged
What model replaced the plum pudding model?
Nuclear
model
How did Niels Bohr adapt the nuclear model?
He suggested that
electrons
orbit the
nucleus
at specific distances
What did James Chadwick discover?
The existence of
neutrons
within the
nucleus
Relative Charge of Proton?
+1
Relative Charge of Neutron?
0
Relative charge of electron?
-1
Why do atoms have no overall charge?
The number of
electrons
is equal to the number of protons in the
nucleus.
What is represented by the atomic number?
The number of
protons
in the
nucleus
What is the radius of an atom?
0.10 nm
OR 1×10^(-3 )
What is the radius of a nucleus?
1
× 10^(
-14
)
What is the mass of electrons?
Negligible
μ(n)
What are isotopes?
Atoms
of the same element with a different number of
neutrons
How many electrons can occupy the first shell of an atom?
2
How many electrons can occupy the second shell of an atom?
8
How many electrons can occupy the third shell of an atom?
8
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