Why is a spectrum for a given element unique for that element? a. no element has more than two electrons in the first shell. b. each element has a unique arrangement of electrons. c. atoms of different elements have different masses. d. atomic nuclei contain no electrons.

This is a mixture that has the same composition throughout.

Which material burns faster? metal aluminum

Read the claim. breakfast is an important meal. it jump starts the body’s process of using calories to break down food. appetite can decrease with age, but going too long without eating causes metabolism to slow down. current research shows that incorporating legumes such as lentils and chickpeas into meals boosts metabolism for twenty-four hours. who might benefit from this claim? people who have a fast metabolism stores that sell exercise equipment people who take vitamin supplements grocery stores that sell legumes