Multiple Choice
Which isotope has 17 protons and 18 neutrons?
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4. Atoms and Elements
Isotopes
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Titanium-48 is an isotope of titanium. How many protons does a neutral atom of have?
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Verified step by step guidance1
Understand that the isotope notation, such as Titanium-48, indicates the element titanium with a mass number of 48. The mass number is the sum of protons and neutrons in the nucleus.
Recall that the number of protons in an atom defines the element and is called the atomic number. For titanium, the atomic number is 22, which means every titanium atom has 22 protons.
Note that the mass number (48 in this case) is not the number of protons but the total number of protons plus neutrons.
Since the problem asks for the number of protons in a neutral atom of Titanium-48, focus on the atomic number, which remains constant for all isotopes of titanium.
Therefore, the number of protons in Titanium-48 is equal to the atomic number of titanium, which is 22.
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