This is a group of elements from the periodic table that have their outer level electrons in the same period as the row in which they are located.

What is the conversion factor between kg/m^3 and g/m^3. express your experimental values for the densities in kg/m^3.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

Why does karst topography exist in some geographic location? a. few climates have enough oxygen b. most regions have rock layers other than limestone c. in most regions, the soil is too thin d. the water is too acidic enough in most places