Multiple Choice
Which of the following correctly represents a bromine isotope that has 46 neutrons?
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4. Atoms and Elements
Isotopes
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An atom has 53 protons and 74 neutrons. Which isotope is it?
A
(iodine-127)
B
(tellurium-127)
C
(xenon-127)
D
(iodine-74)
Verified step by step guidance1
Identify the element by its number of protons. The atomic number (Z) is equal to the number of protons, so here Z = 53. Use the periodic table to find the element with atomic number 53.
Determine the mass number (A) of the isotope by adding the number of protons and neutrons: \(A = \text{protons} + \text{neutrons}\).
Write the isotope notation using the element symbol and the mass number as a superscript: \(^{A}\text{Element}\).
Check the options given and match the element symbol and mass number to identify the correct isotope.
Remember that the isotope is uniquely identified by its element symbol (based on protons) and its mass number (sum of protons and neutrons).
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