EL 4 Organising the elements of life
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8 Terms
How is the periodic table arranged?
atomic number
What is the trend for melting point of metals across a period?
melting point increases
as metal-metal bonds get stronger
due increasing number of delocalised electrons
and decreasing ionic radius due to the electrons being pulled together as number of protons in the nucleus increases
this leads to higher charge density
which attracts ions more strongly so forces of attraction are harder to overcome
Why do elements with giant covalent bonds have high melting points?
lots of energy is needed to breaks strong covalent bonds
What does the melting point of simple molecular substances depend on?
the strength of intermolecular forces
How does the melting point change as a substance gets bigger?
stronger intermolecular forces melting point increase
What are superheavy elements?
Elements with an atomic number greater than 92
What is the "island of stability"?
A theoretical group of superheavy elements with a specific neutron/proton ratio that gives them relatively longer half-lives
Why are superheavy elements unstable?
The strong nuclear force is insufficient to hold their large nuclei together leading to rapid radioactive decay
Note 
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