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Y9 Gcse science
Chemistry
The periodic table
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Cards (16)
The mass number = the number of
protons
+ the number of
neutrons
The mass number is
7.
This means that the total number of protons and neutrons is
7
The atomic number is
3.
This means that there are
3
protons in the nucleus
Number of neutrons =
mass number
-
atomic number
An atom has no
overall charge.
This means the number of
electrons is equal to the number of
protons.
so
atomic number
= number of
electrons
Atoms of the same element have the same number of
protons.
Mass number =
protons
+
neutrons
Atomic number =
protons
How can you calculate
protons
?
Protons =
atomic number
How can you calculate Electrons?
Electrons
=
atomic number
How can you calculate neutrons?
Mass
number -
Atomic
number
In a
proton
, the relative
mass
is 1 and the relative charge is +1
In a
Neutron
, the relative
mass
is 1 but the relative charge is 0
In an
electron
, the relative charge is
-1
and the relative masss is almost
0
How are the groups arranged in the periodic table?
According to their
properties.
How can you tell that the alkali metals are very reactive?
According to their
properties.
How can you tell the noble gases are unreactive?
Full
shell of
outer
electrons.
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