I Intrigue Full Member 10+ Year Member May 27, 2009 #1 Advertisement - Members don't see this ad Which group contains an element with an electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d5 5s2 ? A. 5A B. 7A C. 5B D. 7B E. 8B I thought the answer was c, but the explanation says D. Can anyone tell me how it is D.
Advertisement - Members don't see this ad Which group contains an element with an electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d5 5s2 ? A. 5A B. 7A C. 5B D. 7B E. 8B I thought the answer was c, but the explanation says D. Can anyone tell me how it is D.
tdkyun Made in Korea 10+ Year Member May 27, 2009 #2 Intrigue said: Which group contains an element with an electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d5 5s2 ? A. 5A B. 7A C. 5B D. 7B E. 8B I thought the answer was c, but the explanation says D. Can anyone tell me how it is D. Click to expand... d subshell is half filled (4d5) so it is Tc (Technetium) which is in the 7B Upvote 0 Downvote
Intrigue said: Which group contains an element with an electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d5 5s2 ? A. 5A B. 7A C. 5B D. 7B E. 8B I thought the answer was c, but the explanation says D. Can anyone tell me how it is D. Click to expand... d subshell is half filled (4d5) so it is Tc (Technetium) which is in the 7B
