Two representative elements are in the same period of the periodic table. Which statement correctly describes the atoms of the two elements?(1 point)
Responses
They have valence electrons in the same energy level.
They have valence electrons in the same energy level.
They have the same number of electrons.
They have the same number of electrons.
They have the same number of valence electrons.
They have the same number of valence electrons.
They have valence electrons in different energy levels.
They have valence electrons in different energy levels.
They have valence electrons in the same energy level.
Helium is in group 18 of the periodic table. How is helium different from the other elements in this group?(1 point)
Responses
Helium atoms have 2 valence electrons, while atoms of the other elements in the group all have 8 valence electrons.
Helium atoms have 2 valence electrons, while atoms of the other elements in the group all have 8 valence electrons.
Helium atoms have a full outer energy level, while atoms of the other elements in the group do not have a full outer energy level.
Helium atoms have a full outer energy level, while atoms of the other elements in the group do not have a full outer energy level.
Helium atoms have 2 electrons, while atoms of the other elements in the group all have 18 electrons.
Helium atoms have 2 electrons, while atoms of the other elements in the group all have 18 electrons.
Helium atoms have valence electrons in the first energy level, while atoms of the other elements in the group have valence electrons in the second energy level.
Helium atoms have a full outer energy level, while atoms of the other elements in the group do not have a full outer energy level.
The correct statement is: They have valence electrons in the same energy level.
The correct statement is: They have valence electrons in the same energy level.
To determine the answer to this question, we need to understand the periodic table and the concept of periods and valence electrons.
The periodic table is organized into periods (rows) and groups (columns). Elements in the same period have the same number of energy levels (or shells) surrounding their nucleus. Valence electrons are the electrons in the outermost energy level of an atom, and they are responsible for the chemical properties of the element.
When two representative elements are in the same period of the periodic table, it means that they have the same number of energy levels. Since valence electrons are located in the outermost energy level, it follows that these two elements will also have valence electrons in the same energy level. Therefore, the correct statement is that they have valence electrons in the same energy level.