How many electrons are in the outermost principal energy level of an atom of carbon in the ground state

four electrons

Explanation:

Let us attempt to write the electronic configuration of carbon in the ground state. This electronic configuration will now be;

C- 1s2 2s2 2p2

The outermost principal energy level of carbon is the n=2 level which houses the 2s2 and 2p2, making a total of four electrons in the outermost principal energy level of an atom of carbon in the ground state.

To determine the number of cups that should be poured form the liter of orange juice, we convert first 1 liter to cups. In every liter there are 4.23 cups. So, we can pour out 4 cups. Approximately 0.23 cup of the juice will be left.