Multiple Choice
A proton has which of the following electric charges?
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4. Atoms and Elements
Subatomic Particles (Simplified)
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Which element is represented by an atom with 3 protons, 4 neutrons, and 3 electrons?
A
Beryllium-7
B
Lithium-7
C
Helium-7
D
Lithium-6
Verified step by step guidance1
Identify the number of protons in the atom, as the number of protons determines the element's identity. Here, the atom has 3 protons.
Recall that the atomic number of an element is equal to the number of protons. Look up the element with atomic number 3 on the periodic table, which is Lithium (Li).
Determine the mass number of the atom by adding the number of protons and neutrons: mass number = protons + neutrons = 3 + 4.
Use the mass number to identify the isotope of the element. The isotope notation is written as Element-MassNumber, so here it would be Lithium-7.
Confirm that the number of electrons equals the number of protons for a neutral atom, which is true in this case (3 electrons), so the atom is a neutral Lithium-7 isotope.
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