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The formula shows the number of each type of atom in the molecule. There are 2 atoms of sodium, one atom of chromium and four atoms of oxygen, being a total number of 7 atoms.
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We have that for the Question "how many atoms are in Na2CrO4" it can be said that The total number of atoms is

  • X=7 atoms

From the question we are told

how many atoms are in Na2CrO4

Generally

In identifying the  atoms are in Na2CrO4 we must first look closely at the compound   Na2CrO4

We have

Na=1

Cr=2

O=4

Therefore

The total number of atoms is

X=1+2+4

X=7 atoms

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