What does the atomic number signify?
The number of electrons in an atom
The number of protons in an atom
The number of neutrons + protons in an atom
The number of protons + electrons in an atom
If the number of electrons in an atom increases, so does its mass number.
What is the unit used to measure atomic mass units?
imvu
amu
emu
no
What is the percent abundance of an isotope whose relative abundance is 0.65?
35%
45%
65%
69%
Check all statements that are true:
The relative abundances of the isotopes of an element add up to 100.
Each isotope of an element has a different number of electrons.
The atomic number signifies which element an atom is part of.
Isotopes are atoms of an element that contain the same number of protons but a different number of neutrons in the nucleus.
