What is true about lithium, sodium, and potassium? They all have the same numbers of core electrons. They are all roughly the same size atom. They have the same number of valence electrons and core electrons. They all have the same numbers of valence electrons. They have three valence electrons.

Which of the following statements are not true about the Rutherford Planetary Model?   Loss of energy by an electron results in a change in position relative to the nucleus. Orbiting electrons are accelerating. Accelerating electrons give off electromagnetic radiation. Electrons increase distance from the nucleus after energy loss. Electrons follow an orbital path.

Enter the number of electrons in each energy level (shell) for each of the elements. If the energy level does not contain any electrons, enter a 0.

The Aufbau Principle describes the order of subshells in an atom in terms of energy.  Higher numbered shells have higher energy.  It is complicated by occasional overlapping.  The specific order of subshells using the Aufbau Principle can be found using the diagonal arrow diagram found in Chapter 8, and this is the same order found on the periodic table. What is the order of subshells in period 2 ?  2s  ____ What is the order of subshells in period 3 ?  3s  ____ What is the order of subshells in period 4 ?  4s ____   ____ What is the order of subshells in period 5 ? 5s ____   ____