2. Give an example of an element with different number of protons and neutrons. 3. Give an example of an element with same number of protons and neutrons.

4. Which particles form the nucleus of atom?

5. What has bigger mass - nucleus or electrons?

Give me the real answer!

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.