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To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

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Invariant Cations

QuestionAnswer
Hydrogen ion H+
Lithium ion Li+
Sodium Ion Na+
Potassium Ion K+
Rubidium Ion Rb+
Cesium Ion Cs+
Beryllium Ion Be2+
Magnesium Ion Mg2+
Calcium Ion Ca2+
Strontium Ion Sr2+
Barium Ba2+
Aluminum Ion Al3+
Silver Ion Ag+
Zinc Ion Zn2+
Cadmium Ion Cd2+
Ammonium Ion NH4+
Hydronium Ion H30+
Created by: stephen272