Multiple Choice
An atom of zinc has an atomic number of 30 and a mass number of 65. How many neutrons does this atom contain? Give your answer to the nearest whole number.
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2. Atoms & Elements
Isotopes
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Hydrogen has three isotopes: 1H, 2H, and 3H. Which of the following names correctly matches the isotope 2H?
A
Protium
B
Deuterium
C
Hydronium
D
Tritium
Verified step by step guidance1
Understand that isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.
Identify that hydrogen (H) has an atomic number of 1, meaning it has 1 proton in all its isotopes.
Recognize the isotope notation: the superscript number before the element symbol represents the mass number (protons + neutrons). For 2H, the mass number is 2.
Recall the names of hydrogen isotopes: 1H is called Protium (no neutrons), 2H is called Deuterium (1 neutron), and 3H is called Tritium (2 neutrons).
Match the isotope 2H with its correct name, which is Deuterium.
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