An atom contains most of its mass in its nucleus.
The nucleus is composed of protons and neutrons.
Protons weigh 1 Atomic Mass unit (amu) each.
Neutrons weigh 1 amu each.
Electrons, located outside the nucleus in orbitals, weigh 1/1836 amu each.
Yes, in general. All hydrogen atoms contain one proton, most with no neutrons and all neutral atoms with one electron - and the electron has a much smaller mass. Some hydrogen atoms contain one (or, rarely, two) neutrons and so are heavier. But on average the atom has a mass much the same as a proton.
Three-quarters of the Sun's mass is hydrogen. How many hydrogen atoms are in the Sun?
This depends on the mass of the gold sample.
Most hydrogen atoms don't contain any neutrons. Deuterium atoms are hydrogen atoms with one neutron each, and tritium atoms are hydrogen atoms with two neutrons each, but most hydrogen atoms are protium atoms, with no neutrons at all. All other atoms in the universe except protium contain at least one neutron each.
The nucleus.
All atoms of the specified data contain 38 protons, 38 electrons (assuming they are not ions), and 50 neutrons. They are atoms of the element Strontium.
To calculate the grams of zinc containing 6x10^23 atoms, we need to determine the molar mass of zinc, which is approximately 65.38 g/mol. Then, we can use Avogadro's number to find the number of moles (n) of zinc atoms: n = (6x10^23 atoms) / (6.022x10^23 atoms/mol). Finally, we can calculate the mass of zinc: mass = n x molar mass.
More then 99% of an atoms mass is in the nucleus.
the nucleus
Inside the nucleus.
no
mass of protons + mass of neutrons