Textbook Question
How many protons, neutrons, and electrons are in the following atoms? (a) 84Kr (b) 200Hg (c) 70Ga
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Ch.2 - Atoms, Molecules, and Ions
Chapter 2, Problem 28
Each of the following isotopes is used in medicine. Indicate the number of protons and neutrons in each isotope: (a) samarium-153 (b) lutetium-177 (c) bismuth-213 (d) molybdenum-99 (e) lead-212 (f) caesium-131.
Verified step by step guidance1
Identify the atomic number of each element, which corresponds to the number of protons. This can be found on the periodic table.
For each isotope, the mass number is given in the name (e.g., samarium-153 has a mass number of 153).
Calculate the number of neutrons in each isotope by subtracting the atomic number (number of protons) from the mass number: Neutrons = Mass number - Atomic number.
Repeat the calculation for each isotope: (a) samarium-153, (b) lutetium-177, (c) bismuth-213, (d) molybdenum-99, (e) lead-212, (f) caesium-131.
Summarize the number of protons and neutrons for each isotope based on your calculations.
Related Practice
Textbook Question
How many protons, neutrons, and electrons are in the following atoms? (d) 80Br
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Textbook Question
How many protons, neutrons, and electrons are in the following atoms? (e) 184W (f) 181Ta.
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Textbook Question
Fill in the gaps in the following table, assuming each column represents a neutral atom.
Symbol 79Br
Protons 25 82
Neutrons 30 64
Electrons 48 86
Mass no. 222 207
Complete the first row of the table excluding the isotope symbol.
Complete the second row of the table excluding the row with isotope symbol.
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Textbook Question
Fill in the gaps in the following table, assuming each column represents a neutral atom.
Symbol 79Br
Protons 25 82
Neutrons 30 64
Electrons 48 86
Mass no. 222 207
Complete the third row of the table.
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Textbook Question
Fill in the gaps in the following table, assuming each column represents a neutral atom.
Symbol 79Br
Protons 25 82
Neutrons 30 64
Electrons 48 86
Mass no. 222 207
Complete the fourth row of the table.
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