Chemistry-atoms and the periodic table

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what is the relative atomic mass?
Ar. the mass of an element,measured on a scale that compares masses of atoms with carbon-12. used to express mass of an atom.
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what is the symbol for relative molecular mass?
Mr
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what is the name for the energy levels around the nucleus?
shells or orbits. first shell contains up to 2 electrons, shells 2 and 3, 8 electrons
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how can we work out the number of electrons in a shell?
by seeing its proton/atomic number, as that will tell us the number of electrons, which is the same as the proton number.
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what is electron configuration?
an alternative term for electronic structure
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what does the group number tell us about the element?
gives us the number of electrons in the outer shell
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what does the period tell us about the element?
indicates how many shells of electrons the atom has
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what is an atom?
the simple particles-makes up all other molecules
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how many different types of particles make up an atom?
3
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where is most of the mass of an atom concentrated
the nucleus bc very tiny nucleus and big big and small electrons to move around
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what is a double covalent bond?
each atom contributes two electrons each
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finished:)x
x
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Card 2

Front

what is the symbol for relative molecular mass?

Back

Mr

Card 3

Front

what is the name for the energy levels around the nucleus?

Back

Preview of the front of card 3

Card 4

Front

how can we work out the number of electrons in a shell?

Back

Preview of the front of card 4

Card 5

Front

what is electron configuration?

Back

Preview of the front of card 5
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