group 1...is 1 valence.
group 2...is 2 valence.
Gallium is a mono-atomic metal element. So their atoms are atoms, and as many as you have!
In the compound Al₂O₃, there are two aluminum (Al) atoms and three oxygen (O) atoms. Aluminum has 3 valence electrons, so 2 Al atoms contribute a total of 6 valence electrons. Oxygen has 6 valence electrons, so 3 O atoms contribute 18 valence electrons. Therefore, the total number of valence electrons in Al₂O₃ is 6 + 18 = 24 valence electrons.
8 valence electrons
Isopropyl alcohol, or isopropanol (C3H8O), has a total of 20 valence electrons. The carbon atoms contribute 12 valence electrons (3 carbon atoms with 4 electrons each), the hydrogen atoms contribute 8 valence electrons (8 hydrogen atoms with 1 electron each), and the oxygen atom contributes 6 valence electrons. Thus, when you sum them up (12 + 8 + 6), you get a total of 20 valence electrons.
Hydrogen has 1 valence electron, whereas helium has 2 valence electrons.
Oxygen atoms have 6 valence electrons, while sulfur atoms have 6 valence electrons as well.
Oxygen has six valence electrons.
Gallium is a mono-atomic metal element. So their atoms are atoms, and as many as you have!
In the compound Al₂O₃, there are two aluminum (Al) atoms and three oxygen (O) atoms. Aluminum has 3 valence electrons, so 2 Al atoms contribute a total of 6 valence electrons. Oxygen has 6 valence electrons, so 3 O atoms contribute 18 valence electrons. Therefore, the total number of valence electrons in Al₂O₃ is 6 + 18 = 24 valence electrons.
Aluminum has 3 valence electrons.
8 valence electrons
3
Four.
Isopropyl alcohol, or isopropanol (C3H8O), has a total of 20 valence electrons. The carbon atoms contribute 12 valence electrons (3 carbon atoms with 4 electrons each), the hydrogen atoms contribute 8 valence electrons (8 hydrogen atoms with 1 electron each), and the oxygen atom contributes 6 valence electrons. Thus, when you sum them up (12 + 8 + 6), you get a total of 20 valence electrons.
carbon has 4 valence electrons and can form a maximum 4 bonds with other atoms.
The number of valence electrons in an atom determines its ability to form ions. Atoms that have few valence electrons tend to lose them to form positive ions, while atoms with many valence electrons tend to gain electrons to form negative ions. The ionic charge of an ion is related to the number of electrons gained or lost during the formation of the ion.
Hydrogen has 1 valence electron, whereas helium has 2 valence electrons.