* Atomic Mass: Hydrogen has an atomic mass of approximately 1 atomic mass unit (amu), while lead has an atomic mass of approximately 207 amu. This means a lead atom is about 207 times heavier than a hydrogen atom.
* Equal Mass, Different Number of Atoms: If you have 1 kg of each element, you have the same mass. But since lead atoms are much heavier, you'll have significantly fewer lead atoms in that 1 kg compared to the number of hydrogen atoms in 1 kg.
Think of it like this: Imagine you have a bag of marbles and a bag of bowling balls, both weighing the same amount. You'll have many more marbles in the bag than bowling balls, even though they weigh the same.
To calculate the difference: You could use Avogadro's number (6.022 x 10^23) to determine the exact number of atoms in each kilogram, but the key takeaway is that hydrogen, with its much smaller atomic mass, will always have a greater number of atoms for a given mass compared to lead.
