91影视

Which has the larger second ionization energy, lithium or beryllium? Why?

Explain why a graph of ionization energy versus atomic number (across a row) is not linear. Where are the exceptions? Why are there exceptions?

Account for the fact that the line that separates the metals from the nonmetals on the periodic table is diagonal downward to the right instead of horizontal or vertical.

Make sense of the fact that metals tend to lose electrons and nonmetals tend to gain electrons

Which is larger, the H 1s orbital or the Li 1s orbital? Why? Which has the larger radius, the H atom or the Li atom? Why?

There are an infinite number of allowed electronic transitions in the hydrogen atom. Why don鈥檛 we see more lines in the hydrogen emission spectrum?

Explain what is meant by the term 鈥渆xcited state鈥� as it applies to an electron. Is an electron in an excited state higher or lower in energy than an electron in the ground state? Is an electron in an excited state more or less stable than an electron in the ground state?

In going across a row of the periodic table, electrons are added and ionization energy generally increases. In going down a column of the periodic table, electrons are also being added but ionization energy decreases. Explain

Which is higher in energy: the 2s or 2p orbital in hydrogen? Is this also true for helium? Explain

The Bohr model only works for one electron species. Why do we discuss it in this text (what鈥檚 good about it)?