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please help me with chemistry?

im working on a crossword puzzle my teacher made for us, and i need some help.

1) major deposits of this metal and a popular ski resort are found near a town with a name closely related to the name of this element (9 letters)

2) only non-metal that forms a +3 ion to be like a noble gas (5 letters)

3) the number of these gives an atom its identity (7 letters)

4) the heaviest rare earth element (10 letters)

5) a subatomic partial without charge (7 letters)

6) atoms of the same element with different numbers of neutrons (8 letters)

7) the least reactive chalcogen (8 letters)

8) if i had a high __________, you might say that i really need an electron (17 letters)

Answers (3)

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5) a subatomic partial without charge (7 letters): Neutron

4) the heaviest rare earth element (10 letters): Lanthanum/Lanthanide series

3) the number of these gives an atom its identity (7 letters): Protons

Reference: highschool chemistry

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8 - electronegativity