A 0.4272 g sample of an element contains 2.241 x 10 ^21 atoms . what is the symbol of the element?

Likely (indium.)

Explanation:

Number of atoms: .

Dividing, , the number of atoms by the Avogadro constant, , would give the number of moles of atoms in this sample:

.

The mass of that many atom is . Estimate the average mass of one mole of atoms in this sample:

.

The average mass of one mole of atoms of an element ( in this example) is numerically equal to the average atomic mass of that element. Refer to a modern periodic table and look for the element with average atomic mass . Indium, , is the closest match.

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.