Multiple Choice
Given the mass spectrum data of an element with isotopes having masses of 10 amu (20% abundance), 11 amu (50% abundance), and 12 amu (30% abundance), calculate the atomic weight and identify the element.
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Atomic Mass
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is the mass number of an atom with 5 protons and 7 neutrons?
A
10
B
12
C
5
D
7
Verified step by step guidance1
Identify the number of protons in the atom, which is given as 5. The number of protons is also known as the atomic number.
Identify the number of neutrons in the atom, which is given as 7.
Understand that the mass number of an atom is the sum of the number of protons and neutrons in the nucleus.
Use the formula for mass number: \( \text{Mass Number} = \text{Number of Protons} + \text{Number of Neutrons} \).
Substitute the given values into the formula: \( \text{Mass Number} = 5 + 7 \).
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