What is the number of protons in an atom with the electron configuration of 2-5? (1) 5
(2) 2
(3) 3
(4) 7
Answer and Explanation:
If we take a look at the periodic table on the Reference table, we can find that the element with electron configuration 2-5 is N (nitrogen). The atomic number of the element (lower right corner) is always equal to the number of protons which is 7. Alternatively, you can simply add 2+5 = 7 which is equal to the number of electrons and protons in a neutral atom. Choice 4 is the correct answer.
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August 2022 test