An atom has the configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰ in the ground state. What is its atomic number? A) 10 B) 18 C) 20 D) 30 E) More information is needed.

Question

Quizplus · Accepted Answer

The atomic number is the total number of protons in an atom, which is equal to the number of electrons in a neutral atom. The given configuration translates to 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10, summing the superscripts gives 30 electrons, so the atomic number is 30.

An Atom Has the Configuration 1s22s22p63s23p64s23d10 in the Ground State

An Atom Has the Configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰ in the Ground State