Meteorite Main Mass

I DONT UNDERSTAND THIS ! PLZZZZ HELP !!!!! DUE TOMORROW!!!Ionisation energy stuff?

In 1911, a 40kg meteorite fell in Egypt. Isotopic and chemical analysis of oxygen extracted from this meteorite showed a different relative atomic mass to that of oxygen normally found on Earth. This value matched measurements made of the Martian atmosphere by the Viking landing in 1976, proving tht the meteorite had originated from Mars.

a) i) Oxygen has three main isotopes ^16O , ^17O, ^18O . State the no. of protons. neutrons and electrons in ^16O and ^17O.

ii) Suggest why the relative atomic mass of Martian oxygen is different from that of oxygen obtained from Earth.

b) The first ionisation energy of oxygen is 1310 kJ/mol .
i)Write an equation, including state symbols, to represent the first ionisation energy of oxygen.

ii) Suggest why there is very little difference between the first ionisation energies of ^16O , ^17O and ^18O

a) i)protons/electron:8 (there is always an equal number of protons as there are electrons.. vice versa and its atomic number tells you how many that is)
neutrons:for 160- 152 and for 170-162 (to find the number of neutrons, subract the given mass number of the isotope by its atomic number(number of protons))

thats all i know but its better than nothing!




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