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True.. Materials are grouped for convenience,study there properties and their uses.
jaydenmartinez
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scan this question u will get
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jaredggrw
Element. Atomic mass. Mean
1. lithium 7.
2. Sodium. 23. 7+39/2
3.potassium. 39. =23
Explanation:
I hope my answer is helpful for you
tommy6mpr
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