Multiple Choice
Which element has 13 protons (i.e., atomic number )?
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4. Atoms and Elements
Periodic Table: Element Symbols
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Which element is a neutral atom with 38 electrons?
A
Yttrium (Y)
B
Rubidium (Rb)
C
Zirconium (Zr)
D
Strontium (Sr)
Verified step by step guidance1
Recall that a neutral atom has an equal number of protons and electrons. Therefore, the atomic number of the element equals the number of electrons in a neutral atom.
Identify the atomic number of each element given in the options. The atomic number corresponds to the number of protons (and electrons in a neutral atom).
Look up the atomic numbers: Yttrium (Y) has atomic number 39, Rubidium (Rb) is 37, Zirconium (Zr) is 40, and Strontium (Sr) is 38.
Since the problem asks for the element with 38 electrons, find the element whose atomic number is 38, which corresponds to Strontium (Sr).
Conclude that the neutral atom with 38 electrons is Strontium (Sr), because its atomic number matches the number of electrons in a neutral atom.
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