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atomic structure & periodic table

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Total cards: 7•Content version: v4•Public deck•Updated: 8/1/2026

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#1
Front (Question)

relative atomic mass (A subscript r) definition

Back (Answer)

-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

#2
Front (Question)

general formula for calculating Ar

Back (Answer)

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

#3
Front (Question)

Mr(subscript r) =

Back (Answer)

the gfm

#4
Front (Question)

first 20 elements of the periodic table

Back (Answer)

• H, He • Li, Be, B, C, N, O, F, Ne • Na, Mg, Al, Si, P, S, Cl, Ar • K, Ca mnemonic: Hi! Hello! Little Betty’s Brother Came Now Only From Netherlands. Naughty Maggie Always Sings Popular Songs Clapping Around Kitchen Cabinets

#5
Front (Question)

group vs period number

Back (Answer)

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

#6
Front (Question)

group names

Back (Answer)

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

#7
Front (Question)

isotopes

Back (Answer)

• same atomic number, different mass numbers - isotopes of the same element have the same chemical properties