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10 Cards in this Set
- Front
- Back
how many colums are there in the PTE?
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there are 18 columns
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how is the PTE groups organisezed?
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by atomic number and their properties.
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what are the 7 things that you already know by looking at at an element box?
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1. the atomic number
2. #of protons 3. #of electrons 4. its symbol 5. the elements name 6. atomic mass 7. #of neutrons = atomic mass- atomic # is the average #of neutrons |
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what do you have if you change the number of neutrons?
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if you change the number of neutrons you will have an isotope
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what do you have if you change the number of electons?
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ifyou change the number of electons you will have an ion.
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what happens if you changethe number of protons?
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what happens is that it will change the atom to another element.
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what are the groups at the bottom of the PTE called and where do they belong?
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the lanthanides & the actinides. they both fit in the scamdium fmily.
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what charge does a proton have? what charge does an electron have?
what charge does a neutron have? |
1. protons have a postive charge
2. electron has a negative charge 3. neutron has no charge\ neutal |
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how did mendeleev set his PTE up?
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by atomic mass( lightest to heavest)
elements with the same properties went in the same rows. |
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why is hydrogen and helium not connected to the rest of the columns?
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because they react differently to all the other elemnts
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