The electron configuration of atoms of a noble gas could be: 1s 22s 22p 6
1s 22s 22p 3
1s 22s 2
1s 22s 22p 4
none of the above

The answer to your question is the first choice

Explanation:

Data

 Noble gas electron configuration

Noble gases are located in group Vlll in the periodic table, this means that they have eight electrons in their outermost shell.

Then, to solve this problem count the number of electrons in this shell.

1s²2s²2p⁶       This configuration has 8 electrons in the outermost shell

                         This is the right answer

1s²2s²2p³         This electron configuration has 5 electrons in their outermost shell    

1s²2s²                This electron configuration has 2 electrons in their outermost shell.  

1s²2s²2p⁴          This electron configuration has 6 electrons in their outermost shell.

none of the above

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?