Question

indicate whether each statement about the reactivity of elements is true or false.

1. the eight - element periodicity found in the periodic table is related to the number of electrons in the outermost energy level of the atoms that make up each element. (click to select)
2. electrons in the first energy level of an atom are called valence electrons. (click to select)
3. for atoms important to life, if the first energy level is the outermost shell, it is stable with two electrons. if any other energy level is the outermost shell, it is stable with eight electrons. (click to select)
4. atoms tend to react in ways that give each atom a stable outer shell of electrons. (click to select)
5. atoms with an outer shell that is almost empty are located on the right side of the periodic table while atoms with an outer shell that is full or almost full are located on the left side of the periodic table. (click to select)
6. atoms in the same row of the periodic table tend to have the same number of valence electrons. (click to select)
7. atoms with seven valence electrons tend to be nonreactive. (click to select)

Explanation:

1. The periodicity in the Periodic Table is due to the electron - shell structure, especially the number of outer - shell electrons. So, this statement is true.
2. Valence electrons are in the outermost energy level, not the first. So, this statement is false.
3. The first energy level is stable with 2 electrons when it's the outermost shell, and other outer shells are stable with 8 electrons for life - important atoms. This is true.
4. Atoms react to achieve a stable electron configuration, usually a full outer shell. This is true.
5. Atoms with almost empty outer shells are on the left side and those with full or almost full outer shells are on the right side of the Periodic Table. So, this statement is false.
6. Atoms in the same group (column) have the same number of valence electrons, not the same row. So, this statement is false.
7. Atoms with 7 valence electrons are highly reactive as they want to gain 1 electron to achieve a full outer shell. So, this statement is false.

Answer:

1. True
2. False
3. True
4. True
5. False
6. False
7. False