What is the number of protons in an atom with the electron configuration of 2-5? (1) 5
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.
Are you looking for an online regent chemistry tutor? Contact us HERE
We also have:
August 2022 test