All the elements of a family in the periodic table have what feature in common? a. they all have similar chemical properties. b. they all have the same number of protons in the nucleus. c. they are all located in the same horizontal row or period. d. they all have the same number of electrons in the electron cloud.

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

What is calcium oxide+diphosphorus pentoxide--> calcium phosphate balanced

Scientist think that animals with remarkably similar embryo development probably shared a common ancestor