Its the middle of the atom _ It contains protons and neutrons _ the nucleus has a positive charge because protons are positively charged and neutrons have no charge.
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What are Electrons?
They move around the nucleus _ They have a negative charge
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What are the masses and charge of each particle?
Proton - RM=1 and RC=+1 _ Neutron - RM=1 and RC=0 _ Electron - RM=1/2000 and RC=-1
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What are the properties of Electron shells?
Electrons always occupy shells _ The lowest energy levels are always filled first _ Only a certain amount of electrons are allowed in each shell - 2 in first shell, 8 in second shell and 8 in the third shell
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What is the Atomic number?
The atomic number says how many protons there are in an atom and also the amount of electrons because ''Amount of protons=Amount of electrons''
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What is the mass number?
The mass number tells you the total number of protons and neutrons in an atom.
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What are isotopes?
Isotopes are different atomic forms of the same element, which have the same number of protons but different numbers of neutrons.
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Who created the Periodic table?
Dmitri Mendeleev
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What is the periodic table arranged in?
Groups and Periods.
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Other cards in this set
Card 2
Front
What are Electrons?
Back
They move around the nucleus _ They have a negative charge
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