Consider a sample containing 0.740 mol of a substance. how many atoms are in the sample if the substance is lead?

4.45 x10^23 atoms to 2 decimal places

Explanation:

No of moles=no of atoms/Avogadro's

constant

Hence 0.740=no of atoms/6.02x

10^23

So no of atoms=0.740x6.02x10^23 atoms

=4.4548x 10^23 atoms

electron microscopy and scanning tunneling microscopes gives us a greater understanding of atoms by being able to see the atom itself, and lets us see some atomic reactions.

explanation:

indium, and thallium have three electrons i think