How many of the following s-block elements do not give characteristic colours in the flame test ? Li, Be, Ca , Ba , Sr , Mg , Na , K , Cs

How many of the following s-block elements do not give characteristic

1.	How many of the following s-block elements do not give characteristic colours in the flame test ? Li, Be, Ca , Ba , Sr , Mg , Na , K , Cs
Answer» SOLUTION :TWO , Be and MG