Is the above set a group under multiplioation modulo 7

Is the set 1,2,3,4,5,7} a group under addition modulo 7.(b) Is the above set a group under multiplioation modulo 7.

Let G = 1,2,3,4,5,6}. Find the order of all the elements of G under the binary operation“multiplioation modulo 7”

hho that 1,3, 4,5,9} is a group under multiplioation modulo 11

Which two of these properties are seen in group 7 elements?

This question is about elements in Group 7 of the Periodic Table and their compounds.(a) (i) Give the name of this group of elements. (1) ....................................................................................................................................................................................................................................................................................(ii) State the colour of chlorine gas. (1) ....................................................................................................................................................................................................................................................................................(iii) Give a test for chlorine gas.