What is the density of a substance that has a mass of 25.34 g and a volume of 13.2 ml?

Using the periodic table, complete the table to describe each atom. type in your answers.a ? b? c? d? e? f?

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

The p sub shell can hold up to 8 electrons in an atom. true or false?