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Which of the following are elements? O2 Ca KF B

Which of the following are elements? O2 Ca KF B
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4 votes
Which of the following are elements? O2 Ca KF B

User Dpineda
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4 votes
Ca is the only element perhaps B
User Chris West
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6 votes
KF, is the only non element as it's a compound.
User GodsCrimeScene
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