Two representative elements are in the same period of the periodic table. Which statement correctly describes the atoms of the two elements?(1 point) They have the same number of electrons.

They have the same number of valence electrons.

They have valence electrons in different energy levels.

They have valence electrons in the same energy level.

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

What happens when you slowly pulled the carboard?