Answer:
Isotopes of an element will ALWAYS have the same number of protons.
Explanation:
3.00097 x
atoms are contained in 100.0 g of mercury.
<h3>What is moles?</h3>
The mole is defined as the amount of substance that contains as many elementary entities as there are atoms in exactly 12 g of carbon-12.”
Number of moles of mercury = 
Number of moles of mercury = 
= 0.4985 moles
Number of moles of mercury = Number of atoms = moles of Hg x 
= 0.4985 x 
= 3.00097 x
atoms.
Hence, 3.00097 x
atoms are contained in 100.0 g of mercury.
Learn more about the moles here:
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Is divided by the same number that goes into the number being divided evenly so there are no remainers
example....
2 2 1
__ ÷ __ = __
4 2 2
Protons = +1
negatrons = -1
neutrons = 0
<span>electrons = -1
</span>
<span>negatrons are like positrons and they are subatomic particles and are not present in atoms
</span>
so electrons are negatively charged and are present in atoms
hope that helps