4. 2
(b) on micro scale
on commercial scale
(d) on economic scale
Which one of the following compounds can be separated by physical means?
(a) mixture (b) element
(c) compound (d) radical
The most abundant element occurring
5.
6.
3.
7.

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive