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chemistry atoms and periodic table

science
Quiz by julia7c
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Last updated: November 6, 2022
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First submittedMay 2, 2022
Times taken4
Average score11.1%
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Question
Answer
how were the elements originally ordered
increasing relative atomic masses
why did he swap iodine and tellurium
iodine has a lower atomic weight than tellurium
why did mendeleev leave gaps in his table
for yet to be discovered elements
how could he predict properties of new elements
by looking at the properties of the elements next to a gap
how are elements ordered in the modern periodic table
increasing atomic number
what information is used to group elements now
similar chemical properties
why was mendeleev right to make his pair reversal of iodine and tellurium
iodine has similar chemical properties to chlorine and bromine so he made them line up
what determines what row elements are in now
increasing atomic number
what determines what column elements are in now
elements which have similar properties
isotopes are atoms of the same
elements
they have the same number of
protons and electrons
this means they will have the same
atomic number
but a different number of
neutrons
top number un chemical symbols is a
mass number (number of neutrons plus protons)
Question
Answer
botttom number is the
number of protons
to calculate neutrons
mass number minus protons
electronic configuration is the
amount of electrons in each shell
what is special about the group 0 elements
they already have stable arrangements of electrons
what are the properties of metal
high melting points, malleable
elements in the same row all have the same number of
electron shells
elements in the same column all have the same number of
electrons in the outer shell
what is the charge of an electron
negative
what is the charge of a proton
positive
what is the charge of a neutron
no charge
what is the mass of an electron
negligible
what is the mass of a proton
1
what is the mass of a neutron
1
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