Four elements A, B, C, and D have the following electron arrangements in their atoms:<b>A 2,8,6</b> <br> <b>B 2,8,8</b> <br> <b>C 2,8,8,1</b> <br> <b>D 2,8,7</b> <br> <b>(a) </b>What type of bond is formed when element C combines with element D? <br> <b>(b)</b> Which element is an inert gas?<br> <br> <b>(c)</b> What will be the formula of the compound between A and C?<br>