C3T4 Atomic Mass

__ average is the average of a group when factoring in each component’s percentage in the whole

weighted average is the average of a group when factoring in each component’s ___ in the whole

1 ___ mass unit (or amu in short) is defined as exactly 1/12 mass of a carbon-12 atom

1 atomic mass unit (or ___ in short) is defined as exactly 1/12 mass of a carbon-12 atom

1 atomic mass unit (or amu in short) is defined as exactly __ (how much?) mass of a carbon-12 atom

1 atomic mass unit (or amu in short) is defined as exactly 1/12 mass of a __ atom

1 “atomic mass unit” (amu) is also called 1 ___ ( or Da in short)

1 “atomic mass unit” (amu) is also called 1 Dalton (or ___in short)

Element X has two naturally-occurring isotopes: X-a and X-(a+4). If X-a takes 25% in nature, then element X’s atomic mass is ______ amu

Lithium has two naturally-occurring isotopes: the one with 3 neutrons takes 7.59% and the one with 4 neutrons takes 92.41%. Then atomic mass for lithium is ____ amu (Keep three decimals; Due to the difference of unit mass of proton/neutron, the atomic mass found in a periodic table might be different than your calculation, and you need to do the calculation based on the method/value you have learned from class.)