Which element has 6 energy levels and 7 valence electrons?
Astatine (At)
Polonium (Po)
Seaborgium (Sg)
Rhenium (Re)
my answer is D.
level 6 is from Cs to Rn
7 outer shell electrons is in the column under F and Cl (Halogens)
That is At
To determine which element has 6 energy levels and 7 valence electrons, we need to refer to the periodic table.
We first need to find the element with 6 energy levels. The energy levels for elements are indicated by the period number in the periodic table.
Astatine (At) is in period 6, so it has 6 energy levels.
Polonium (Po) is in period 6, so it also has 6 energy levels.
Seaborgium (Sg) and Rhenium (Re) are both in period 7, so they have 7 energy levels.
Next, we need to determine which of these elements has 7 valence electrons. The valence electrons for elements can be determined by the group number in the periodic table.
Astatine (At) is in group 7, so it has 7 valence electrons.
Polonium (Po) is in group 16, so it does not have 7 valence electrons.
Seaborgium (Sg) and Rhenium (Re) are both in group 7, so they have 7 valence electrons.
Therefore, the element that has 6 energy levels and 7 valence electrons is Astatine (At).
To determine which element has 6 energy levels and 7 valence electrons, we need to first understand the concepts of energy levels and valence electrons.
Energy levels refer to the different orbits or shells in an atom where electrons exist. These energy levels are labeled as 1, 2, 3, and so on, with each level able to hold a specific number of electrons.
Valence electrons are the electrons in the outermost energy level of an atom, which are involved in chemical bonding and determining the element's chemical properties. The number of valence electrons can be found by looking at the element's position in the periodic table.
Now, let's analyze the given elements:
1. Astatine (At) is a halogen element with atomic number 85. Looking at its position in the periodic table, we can find that it has 6 energy levels (since the periods correspond to the energy levels), but it only has 7 valence electrons. Therefore, Astatine is not the correct answer.
2. Polonium (Po) is a metalloid element with atomic number 84. Similar to Astatine, it also has 6 energy levels but only has 6 valence electrons. Thus, Polonium is not the correct answer either.
3. Seaborgium (Sg) is a synthetic element with atomic number 106. Little is known about its electron configuration, but since it is an element with a higher atomic number, it is unlikely to have 6 energy levels. Therefore, Seaborgium is not the correct answer.
4. Rhenium (Re) is a transition metal with atomic number 75. Looking at its position in the periodic table, we can see that it has 6 energy levels (period 6) and also 7 valence electrons. Therefore, Rhenium is the correct answer to the question.
In conclusion, the element with 6 energy levels and 7 valence electrons is Rhenium (Re).