The picture shows two liquid samples are poured into a beaker. as shown, the liquids don’t mix with each other. which statement is true? a) sample a has greater density. b) sample b has greater density. c) the densities are the same because the volumes are the same. d)the densities are different because the volumes are different.

The answer is A. The volume lines on the bottom are just showing the volume of the beaker. The more dense liquid will sink to the bottom

All the given elements belong to the second period of the periodic table

Explanation:

Let's locate the elements with the given atomic numbers:

Z = 3, this corresponds to lithium (Li);Z = 4, this corresponds to beryllium (Be);Z = 5, this corresponds to boron (B);Z = 6, this corresponds to carbon (C);Z = 7, this corresponds to nitrogen (N);Z = 8, this corresponds to oxygen, (O);Z = 9, this corresponds to fluorine, (F).

Now notice that each of these 9 elements can be found in the same row of the periodic table. This is period 2. We may then summarize that all of these elements belong to the same period, period number 2.