An element has the electronic configuration 2.8.5.
Which group and period is the element in?
Group 5 as it has 5 electrons in the outer shell. Period 3 as it has 3 electron shells.
Group 5 as it has 5 electron shells. Period 3 as it has 3 electrons in the outer shell.
Group 3 as it has 3 electrons in the outer shell. Period 5 as it has 5 electron shells.
Group 3 as it has 3 electron shells. Period 5 as it has 5 electrons in the outer shell.
77 exam-style questions on OCR GCSE Chemistry Atomic structure. Each one has a worked solution and a mark scheme showing where the marks go.