atomic structure & periodic table Flashcards

1
Q

relative atomic mass (A subscript r) definition

A

-the weighted mean of the mass numbers of the isotopes of an element, taking into account the abundances of the various isotopes of the element

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2
Q

general formula for calculating Ar

A

(% x mass no. of isotope A) + (% x mass no. of isotope B)…

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3
Q

Mr(subscript r) =

A

the gfm

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4
Q

first 20 elements of the periodic table

A
  1. H, He
  2. Li, Be, B, C, N, O, F, Ne
  3. Na, Mg, Al, Si, P, S, Cl, Ar
  4. K, Ca

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5
Q

group vs period number

A
  • group number of the element = no. of electrons in the outer shell
  • period number of the element = no. of electron shells
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6
Q

group names

A

group 1: alkali metals
group 2: alkali earth metals
group 7: halogens
group 8/0: noble gases

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7
Q

isotopes

A
  • same atomic number, different mass numbers

- isotopes of the same element have the same chemical properties

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