Ask a New Question

Question

Given the following three electron configurations:

1s2 2s2 2p5

How many core electrons does this element have?

A. 4
B. 5
C. 9
D. 2
9 years ago

Answers

DrRebel
D: 2 core electrons
The valence level in an electron configuration is the highest principle quantum number. Using the Afbau symbology that would be highest Principle Quantum Number for the element in question => in this case n = 2. The 1s² is the core configuration with 2 electrons, and 2s²2p⁵ is the valence configuration with 5 electrons.
9 years ago

Related Questions

why do you think that the electronegativity value for hydrogen is so high given its location in the... can someone help me about electric arc furnace process with pictures in each process? thanks a lot I had a Bio lab about gel electrophoresis and PCR. for each lab, we have to make up thoughtful, deta... How many of the following electron configurations are allowed? 1s22s22p7 1s22s22p62d1 [Ne]4s24p4 [A... I'm doing a lab for gel electrophoresis and we added the digests in the wells of the agarose gel... a certain energy that an electron in an atom occupies elect all representations for the domain of a function given by elevation (in feet) at or above sea... Why is lithium not in the electro positive series An atom has the following electron configuration. 1s22s22p63s23p3 How many valence electrons d... In which of the following elections did Abraham Lincoln run as a Republican? the 1847 Congressional...
Ask a New Question
Archives Contact Us Privacy Policy Terms of Use