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ERIC Number: EJ854278
Record Type: Journal
Publication Date: 2005-Jun
Pages: 22
Abstractor: As Provided
ISSN: ISSN-0126-7663
What Comes after Stable Octet? Stable Sub-Shell!
Tan, Kim Chwee Daniel; Taber, Keith S.
Journal of Science and Mathematics Education in Southeast Asia, v28 n1 p81-102 Jun 2005
Previous research has shown that students' existing conceptions are critical to subsequent learning because there is interaction between the new knowledge that the students encounter and their existing knowledge from previous lessons. Taber (1999a) found A-level students in the UK had difficulty in understanding the principles determining the magnitude of ionization energy because of their pre-existing octet rule framework. In a related study, Tan et al. (2005) explored the conceptions of ionization energy of A-level students in Singapore, and found that these students also applied the octet rule framework to decide if an isolated sodium ion would recombine with an electron to reform the sodium atom, and whether another electron could be removed from the sodium +1 (Na[superscript +]) ion. In addition, the study found that there appeared to be an offshoot of the octet rule framework, he "stable fully-filled and half-filled sub-shell" thinking, which the students in Singapore used to explain the trend of ionization energies across Period 3. (Contains 5 tables.)
Southeast Asian Ministers of Education Organization Regional Centre for Education in Science and Mathematics (SEAMEO RECSAM). Jalan Sultan Azlan Shah, 11700 Gelugor, Penang, Malaysia. Tel: +011-60-4-658-3266; Fax: +011-60-4-657-2541; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: High Schools
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Singapore