A chemical reaction has two elements as reactants. Which type of reaction might occur?
synthesis
decomposition
single replacement
double replacement

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

the answer is c

tell me if wrong

there are two significant figures.

explanation:

0.07 g/cm³

1.37 g/cm³