'A Level'

Categories: Site glossary

General Certificate of Education Advanced Level – examinations taken by some students, often at age 18, in England, and used (in particular) to seek admission to university undergraduate courses

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Calcium and oxygen would not need to bond, they would just combine…
Na+ has an extra electron in its outer shell and Cl- is minus an electron
Sodium has one extra electron in its outer shell, and chlorine is minus an electron, so by force pulls they would hold together
Electrons repel each other, keeping them out of the nucleus
Electrons would contain some of the element

Author: Keith

Former school and college science teacher, teacher educator, research supervisor, and research methods lecturer. Emeritus Professor of Science Education at the University of Cambridge. View all posts by Keith