How many atoms of carbon would there be in 5.56g diamond?

There would be 2.79 x 10^23 carbon atoms.

Explanation:

Diamonds are made of carbon. You're given mass and want to convert to number of atoms. The common way to convert between these and other variables is through moles.

First find moles by dividing the mass by the molar mass (of carbon):

moles = 5.56 / 12 = 0.463

Next multiply moles by Avogadro's number to find the number of carbon atoms:

number of C atoms = 0.463 x 6.022 x 10^23 = 2.79 x 10^23

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.