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10 Cards in this Set

  • Front
  • Back
how many colums are there in the PTE?
there are 18 columns
how is the PTE groups organisezed?
by atomic number and their properties.
what are the 7 things that you already know by looking at at an element box?
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
what do you have if you change the number of neutrons?
if you change the number of neutrons you will have an isotope
what do you have if you change the number of electons?
ifyou change the number of electons you will have an ion.
what happens if you changethe number of protons?
what happens is that it will change the atom to another element.
what are the groups at the bottom of the PTE called and where do they belong?
the lanthanides & the actinides. they both fit in the scamdium fmily.
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
how did mendeleev set his PTE up?
by atomic mass( lightest to heavest)
elements with the same properties went in the same rows.
why is hydrogen and helium not connected to the rest of the columns?
because they react differently to all the other elemnts