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

Name: An atom has subshells 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 in the ground state.What is its atomic number? A) 10 B) 18 C) 20 D) 30 E) More information is needed.
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Question

Quizplus · Accepted Answer

The atomic number is the total number of electrons in a neutral atom. Adding the electrons from the given subshells: 2 (1s) + 2 (2s) + 6 (2p) + 2 (3s) + 6 (3p) + 2 (4s) + 10 (3d) = 30.

An Atom Has Subshells 1s22s22p63s23p64s23d10 in the Ground State

An Atom Has Subshells 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰ in the Ground State