| Front | why does first ionization energy decrease from top to bottom across the periodic table? |
| Back | elements near the bottom of the table have more core electrons shielding the valence electrons from the attractive force of the nucleus and are therefore easier, and take less energy, to remove |
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| Front | the greater the lattice energy, the [more/less] stable the compound |
| Back | more |
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| Front | define: mole |
| Back | the amount of a substance that contains as many atoms as there are in 12g of carbon-12, which is 6.022 x 1023 of them |
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