Scelta multipla
Bromine has an atomic number of 35. How many neutrons are present in the most abundant isotope of bromine?
250
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2. Atoms & Elements
Isotopes
Scelta multipla
Astatine-210 is one of the most stable isotopes of astatine. How many neutrons are present in an atom of astatine-210?
A
125
B
125
C
85
D
210
Guida verificata passo dopo passo1
Identify the atomic number (Z) of astatine, which is the number of protons in the nucleus. For astatine, Z = 85.
Recognize that the isotope notation astatine-210 means the mass number (A) is 210. The mass number is the total number of protons and neutrons in the nucleus.
Use the relationship between mass number, protons, and neutrons: \(A = Z + N\), where \(N\) is the number of neutrons.
Rearrange the formula to solve for neutrons: \(N = A - Z\).
Substitute the known values: \(N = 210 - 85\), which gives the number of neutrons in astatine-210.
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