Question

the unit of mass used for atoms: *
moa - mass of atom
uam - unit of atomic mass
amu - atomic mass unit
g - grams
which of the following statements is true regarding the nucleus: *
most of the mass of the atom is in the nucleus
protons and electrons are in the nucleus
most of the nucleus is empty space with little mass for the atom.
electrons and neutrons are in the nucleus
which of the following is true regarding electrons:
they are found inside the nucleus of the atom
the number of electrons always equals the number of protons
electrons have a positive charge
the mass of an electron is so small that we dont count it in the atomic mass

Explanation:

• For the first question:
• The atomic mass unit (amu) is the standard unit for measuring the mass of atoms.
• For the second question:
• The nucleus contains protons and neutrons. Electrons are outside the nucleus. Most of the atom's mass is in the nucleus.
• For the third question:
• Electrons are outside the nucleus. In a neutral atom, the number of electrons equals the number of protons, but in ions (charged atoms), this is not the case. Electrons have a negative charge. Their mass is negligible compared to protons and neutrons, so it is not counted in atomic mass.

Answer:

• First question: amu - atomic mass unit
• Second question: most of the mass of the atom is in the nucleus
• Third question: The mass of an electron is so small that we don't count it in the atomic mass