Easy periodic table question, pls help What are columns (up and down) of the periodic table called? How does the element’s column relate its number of valence electrons?

Will mark brainliest 26. which of these statements are true? (3 points) a. gases are compressible b. gases fill their containers completely c. the pressure of a gas is independent of the temperature d. gases have mass e. gases exert pressure f. the pressure of a gas is dependent on the volume g. gas pressure results from the collisions between gas particles h. gases have a definite volume and shape

What does x represent in the formula for the compound xcl4?

Which other elements contain the same number of outer electrons as sodium