1. False, 2. True, 3. True, 4. False, 5. True, 6. False, 7. True, 8. False, 9. Incomplete and 10. True.
1. Atoms have no weight - False
Atomic mass is the total mass of an atom. This is roughly equal to the total number of protons and neutrons with a small addition of electrons.
2. The electron is the heaviest part of the atom - in fact
3. All protons have the same mass - True
4. All atoms have the same mass - False
The mass of each element depends on the number of protons and neutrons it contains.
5. All neutrons have the same mass. - True
6. An oxygen atom weighs as much as a nitrogen atom. - False
o2 has a molecular weight of 15.9994 g/mol, and the molar mass of nitrogen is 14.0067 g/mol.
7. All oxygen atoms have the same mass - True
8. If we add neutrons and electrons to find the mass of an atom, the atomic mass of calcium is 40.08 - False
The number of protons and neutrons in an element determines its mass number. Protons and neutrons are the mass numbers.
9. The circular mass is 41, which is not quite correct.
10. Isotopes are identical atoms with differing numbers of protons. - True
Learn more about the atoms at
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