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If the Bohr model not accurate, why do scientists use it?
to predict the chemical properites of elements; to know if they are stable or unstable (need to bond)
What happens if, the number of protons change?
the element changes
What is an isotope?
atom with the same number of protons but different number of neutrons
How does an ion form?
It gains or loses electrons
True or false. The atomic mass of an element is equal to the number of electrons and protons it has.
false
O is short for...
oxygen
How many electrons can the first shell have?
2
How many neutrons does Argon have?
22
How many electrons does Carbon have?
6
Which element has more protons, helium or carbon?
carbon
In a periodic table, are groups vertical or horizontal?
vertical
How is the atomic number of an element decided?
by number of protons
How can you find out the number of neutrons an element has?
the atomic mass minus number of protons
Which subatomic particle has a positive charge?
positive
Which subatomic particle has no charge?
neutron
Which two particles does the nucleus consist of?
protons and neutrons
Where do electrons live?
in shells
Which particle has a negative charge?
electron
What is the smallest subatomic particle?
neutron
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