1) Which element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p³? a) silicon (Si) b) sulfur (S) c) phosphorus (P) d) aluminum (Al) 2) Which element has the configuration 1s² 2s² 2p⁶ 3s²? a) magnesium (Mg) b) calcium (Ca) c) sodium (Na) d) potassium (K) 3) Identify the element with configuration [Ar] 4s² 3d¹⁰ 4p³. a) arsenic (As) b) germanium (Ge) c) gallium (Ga) d) selenium (Se) 4) Which element matches the configuration [Kr] 5s¹? a) strontium (Sr) b) rubidium (Rb) c) yttrium (Y) d) zirconium (Zr) 5) Which element has the configuration [Ne] 3s² 3p⁵? a) sulfur (S) b) chlorine (Cl) c) argon (Ar) d) potassium (K) 6) Identify the element with configuration 1s² 2s² 2p¹. a) beryllium (Be) b) boron (B) c) carbon (C) d) nitrogen (N) 7) Which element corresponds to [Xe] 6s² 4f¹⁴ 5d¹⁰ 6p²? a) tin (Sn) b) bismuth (Bi) c) lead (Pb) d) polonium (Po) 8) Identify the element with electron configuration [Ar] 4s² 3d⁶. a) chromium (Cr) b) iron (Fe) c) manganese (Mn) d) cobalt (Co) 9) Which element has the configuration [He] 2s² 2p²? a) nitrogen (N) b) boron (B) c) oxygen (O) d) carbon (C) 10) Identify the element with configuration [Kr] 5s² 4d¹. a) yttrium (Y) b) zirconium (Zr) c) rubidium (Rb) d) technetium (Te) 11) What ion is represented by the configuration 1s² 2s² 2p⁶ 3s² 3p⁶? a) S2- b) Ca2+ c) K+ d) any species with 18 electrons 12) Which ion matches the configuration [Ar] 4s² 3d¹⁰? a) Zn2+ b) Cu1+ c) Ga3+ d) Ni2+ 13) The configuration, 1s² 2s² 2p⁶, represents which type of species? a) neutral neon atom only b) only F- c) could be Ne, F-, O2-, or Na+ d) only a +1 ion 14) Which is the correct electron configuration for nickel? a) [Ar] 4s² 3d8 b) [Ar] 4s¹ 3d9 c) [Ar] 4s² 3d10 d) [Ar] 4s² 3d6 15) Which configuration represents selenium? a) [Ar] 4s² 3d¹⁰ 4p2 b) [Ar] 4s² 3d¹⁰ 4p4 c) [Kr] 5s² 4d¹⁰ 5p4 d) [Ne] 3s² 3p6 16) Which is the correct configuration for Ca2+. a) [Ar] 4s² b) [Ar] c) [Ne] 3s² d) [He] 2s² 2p⁶ 17) Which configuration represents Cl-? a) [Ne] 3s² 3p⁵ b) [Ar] c) [Ne] 3s² 3p⁶ d) [Ar] 4s¹ 18) Which configuration represent Tin? a) [Kr] 5s² 4d¹⁰ 5p² b) [Kr] 5s² 4d¹⁰ 5p⁴ c) [Xe] 6s² 4f¹⁴ 5d¹⁰ d) [Ar] 4s² 3d¹⁰ 4p² 19) Which configuration represents bromine? a) [Ar] 4s² 3d¹⁰ 4p⁵ b) [Ar] 4s² 3d¹⁰ 4p³ c) [Ne] 3s² 3p⁵ d) [Ar] 4s² 3d¹⁰ 4p² 20) Which configuration matches potassium? a) [Ne] 3s² 3p⁵ b) [Ar] 4s¹ c) [Ar] 4s² d) [Kr] 5s¹

Electron Configuration Decoding

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