the question in my paper was ; what is the electronic configuration of alkali metals halogens and noble gases i wrote alkali metals; 1s2, 2s1 halogens; 1s2 ,2s2,2p3 nobel gases; 1s2 2s2 2p4 is this answer correct

Maybe you should get some from your teacher and learn more so you can get your grades up and maybe study a bit more

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).