U1-2-0 - N4 Revision
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Name of group 1 in the periodic table
Alkali metals
Name of group 7 in the period table
Halogens
Name of group 0/8 in the periodic table
Noble gases
List the diatomic elements (there are 7)
H2 N2 O2 F2 Cl2 Br2 I2
A proton has a mass of ….. and a charge of …. .
mass = 1 charge = +1
A neutron has a mass of …. and a charge of …. .
mass = 1 charge = 0
An electron has a mass of …. and a charge of …. .
mass = 0 charge = -1
Atomic number
The number of protons. Defines an element.
Mass number
The number of protons and neutrons
Why are atoms neutral?
Equal number of protons and electrons. + and - charges cancel out.
In the nuclide notation shown, 17 is the …
Atomic number
In the nuclide notation shown, 35 is the …
Mass number
What is a valence electron?
An electron in the outermost electron shell (furthest from the nucleus).
Ion
A charged atom formed when an atom has gained or lost electrons
Why do atoms form ions?
To gain a full outer shell of electrons. This makes them more stable.
Ions have the same electron arrangement as the nearest ….
Noble gas
Explain why noble gases do not form ions.
They already have a full outer shell.
The number of protons. Defines an element.
Atomic number
The number of protons and neutrons
Mass number
A charged atom formed when an atom has gained or lost electrons
Ion
State the structure of noble gases.
Monatomic (exist as single atoms).
How do you calculate the number of neutrons in an atom?
No. of neutrons = Mass number – Atomic number
Are metal ions positive or negative?
Positive
Are non-metal ions positive or negative?
Negative