Multiple Choice
Which of the following ions have different numbers of electrons?
2. Atoms & Elements
Ions
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Give the correct number of protons, neutrons and electrons for the following isotope:
.
A
35 protons, 35 neutrons, 81 electrons
B
35 protons, 46 neutrons, 36 electrons
C
81 protons, 46 neutrons, 82 electrons
D
35 protons, 46 neutrons, 34 electrons
Verified step by step guidance1
Identify the element from the symbol. The symbol 'Br' represents Bromine.
Determine the number of protons. The atomic number, which is the number at the bottom left (35), indicates the number of protons in Bromine.
Calculate the number of neutrons. The mass number is given at the top left (81). Subtract the atomic number (35) from the mass number (81) to find the number of neutrons: 81 - 35 = 46 neutrons.
Determine the number of electrons. Since the isotope is Br⁻, it has gained one extra electron compared to the neutral atom. A neutral Bromine atom has 35 electrons, so Br⁻ has 35 + 1 = 36 electrons.
Summarize the findings: The isotope has 35 protons, 46 neutrons, and 36 electrons.
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