I've got a few chemistry questions that was on my test. Anybody can help?

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1) Which compound has the highest melting point?

Element
Proton number
Q 6
R 9
T 16
U 19


a. QT2
b. QR4
c. U2T
d. R2

the numbers are subscript by the way.
 
just look the atomic number of each element, the higher the atomic number the more dense the molecule is and thus harder to break which result in a higher melting point.
 
just look the atomic number of each element, the higher the atomic number the more dense the molecule is and thus harder to break which result in a higher melting point.
 
just look the atomic number of each element, the higher the atomic number the more dense the molecule is and thus harder to break which result in a higher melting point.
 
just look the atomic number of each element, the higher the atomic number the more dense the molecule is and thus harder to break which result in a higher melting point.
 
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