Open Question
Fill in the gaps for the following table.
2. Atoms and the Periodic Table
Ions (Simplified)
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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 'Br'. This is bromine, which is element number 35 on the periodic table.
Determine the number of protons. The atomic number, which is the lower number (35), represents the number of protons in the nucleus of the atom.
Calculate the number of neutrons. The mass number (upper number, 81) is the sum of protons and neutrons. Subtract the number of protons (35) from the mass number (81) to find the number of neutrons: 81 - 35 = 46 neutrons.
Determine the number of electrons. Since the symbol has a negative charge (Br^-), it means there is one extra electron compared to the number of protons. Therefore, the number of electrons is 35 + 1 = 36 electrons.
Verify the information: The isotope has 35 protons, 46 neutrons, and 36 electrons, which matches one of the given options.
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