Which of the following statements is true? A. the law of conservation of mass states matter can be created or destroyed in chemical reactions

B. atoms of a specific element can have different atomic masses

C. chemical reactions rearrange the atoms in the reactants to yield the products

D. during chemical reactions the number and types of atoms in the reactants is different than the number and types of atoms in the products

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.

What are the coefficients that will balance the skeleton equation below? n2 + h2 → nh3