3.2 Atoms and Ions
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Relative mass of a proton
1
Relative mass of a Neutron
1
Relatice mass of an electron
0.0005
Relative charge of a proton
1+
Relative charge of a neutron
0
Relative charge of an electron
1-
What is the mass nunber of an atom the same as?
Protons and Electrons
How to find the number of neutrons
Mass of the atom - Number of protons
Group number is… what
Numebr of electrons on the atoms outer shell
Define Isotope
Atoms of the same element with the same number of protons and a different number of neutrons
How to find the RAM?
• • mass of each isotope by the abundance (%) • Add together • Divide by 100
Name and state the use of He
Cooling
Why are atoms of noble gases unreactive?
They are atoms and group 8/0 therefore have a full outer shell
Hwo to find the number of occupied electron shells on periodic table?
Check period number
Define the term ‘ionic bonding’
Electrostatic attraction between opposite charged ions
Explain why Calcium Oxide has a high melting point [2 points]
• Strong electrostatic bonds (as it is in a giant ionic lattice formation) between positively and negatively charged ions. • Means more heat reauired to break them down.
how to find RAM?
[(massabundance) + (massabundance)]/100