These are true and false questions and I want to be sure of my answers. Please someone check. Thanks:
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. True
2. Electrons in the first energy level of an atom are called valence electrons. False
3. For atoms important to life, if the first energy level is the outermost shell, it is stable with 2 electrons. If any other energy level is the outermost shell, it is stable with 8 electrons. True
4. Atoms tend to react in ways that give each atom a stable outer shell of electrons. True
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. False
6. Atoms in the same row of the Periodic Table tend to have the same number of valence electrons. False
7. Atoms with 7 valence electrons tend to be non-reactive. False
Did you see that freind responded to your first post?
Sra
Sorry didn't notice, now I saw it.
Comparing the pairs of elements listed below, choose the pair in which both atoms have nuclei with the same number of neutrons.
2311Na and 2412Mg
73Li and 94 Be
3216S and 5425Mn
147N and 168O
Let's check the answers one by one:
1. The statement "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" is True. This is known as the octet rule, which states that atoms tend to gain, lose, or share electrons in order to achieve a stable configuration with 8 electrons in their outermost energy level.
2. The statement "Electrons in the first energy level of an atom are called valence electrons" is False. Valence electrons are the electrons in the outermost energy level of an atom, which is not necessarily the first energy level. The first energy level can hold a maximum of 2 electrons.
3. The statement "For atoms important to life, if the first energy level is the outermost shell, it is stable with 2 electrons. If any other energy level is the outermost shell, it is stable with 8 electrons" is True. In general, the outermost energy level tends to be stable with either 2 or 8 electrons, depending on its position in the periodic table. However, it's important to note that there are exceptions to this rule.
4. The statement "Atoms tend to react in ways that give each atom a stable outer shell of electrons" is True. As mentioned earlier, atoms strive to achieve a stable electron configuration, typically with 8 electrons in their outermost energy level. This drive for stability is the basis for chemical reactions and the formation of chemical bonds.
5. The statement "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" is False. The location of elements on the periodic table is based on their atomic number, not the electron configuration of their outermost shell. The arrangement of elements on the periodic table is based on increasing atomic number and various other factors such as electron configuration patterns.
6. The statement "Atoms in the same row of the Periodic Table tend to have the same number of valence electrons" is False. In general, atoms in the same column or group of the periodic table, rather than the same row, tend to have the same number of valence electrons. The number of valence electrons determines the chemical properties and reactivity of an element.
7. The statement "Atoms with 7 valence electrons tend to be non-reactive" is False. Atoms with 7 valence electrons, such as the halogens in Group 17 of the periodic table, tend to be highly reactive and readily gain one more electron to achieve a stable octet configuration. Therefore, they are not considered non-reactive.
It's always a good practice to verify answers and understanding. By understanding the concepts behind each statement and referring to reliable sources such as textbooks or reputable websites, you can ensure the accuracy of your answers.