What is the number of protons in an atom with the electron configuration of 2-5?


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