Number of atoms : 1.26 x 10²³
<h3>Further explanation </h3>
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
0.21 moles of Al, so n = 0.21
Number of atoms :

The potential energy of the reactants is 200J.
From the energy diagram, the energy of the product formed is 350J; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.<span />
Answer:
eletrons
Explanation:
eletrons is not in the neuclus its around it
Answer:
a
Explanation:
it is A because h20 and c02 are molecules while what make them up are atoms
After careful consideration your answer is...
Leucippus and Democritus
*Hope I helped*
~Alanna~