Textbook Question
The number and arrangement of electrons in an atom's outer energy level (valence shell) determine the atom's
(a) Atomic weight
(b) Atomic number
(c) Molecular weight
(d) Chemical properties
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2. Cell Chemistry & Cell Components
Atoms- Smallest Unit of Matter
Multiple Choice
The average oxygen atom has a mass number of 16 and an atomic number of 8. This means that the number of neutrons in this oxygen atom is:
A
24.
B
8.
C
16.
D
4.
E
2.
Verified step by step guidance1
Understand the concept of atomic number and mass number: The atomic number represents the number of protons in an atom, while the mass number is the sum of protons and neutrons.
Identify the atomic number of oxygen: The atomic number of oxygen is given as 8, which means there are 8 protons in the oxygen atom.
Identify the mass number of oxygen: The mass number of oxygen is given as 16, which is the total number of protons and neutrons.
Calculate the number of neutrons: To find the number of neutrons, subtract the atomic number from the mass number. Use the formula:
Perform the subtraction: Substitute the values into the formula: to find the number of neutrons.
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