How many neutrons in actinium?
subtract
Massnumber-atomicnumber.
Look those up fo Actinium.
thanks. what is 227 - 89? i don't have a calculator on hand
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227 - 89
To determine the number of neutrons in an atom of actinium, we need to know its atomic number and atomic mass.
The atomic number represents the number of protons in an atom's nucleus. The atomic mass is the sum of the protons and neutrons in the nucleus.
In the case of actinium, its atomic number is 89. This means it has 89 protons in its nucleus.
The atomic mass of actinium is approximately 227 atomic mass units (amu). Since the atomic mass is the sum of protons and neutrons, we can subtract the atomic number from the atomic mass to find the number of neutrons.
Number of neutrons = Atomic mass - Atomic number
= 227 amu - 89
= 138 neutrons
Therefore, an atom of actinium has 138 neutrons.