Common-Core/ Grade 7
Science MCQ Based On How are substances represented by models and chemical formulas
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Common-Core Grade 7 - 7 How are substances represented by models and chemical formulas
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A dense nucleus of protons and neutrons.
2X27+[32+(16X4)]X3+18X18
P for every mole of O.
Check the number of atoms of each element .
Sum of the mass of the atoms.
23 and 35.5
Calcium carbonate with 3 oxygen.
Learning aid
The number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus.
Chemical formula
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