Identify the number of valence electrons for these elements on the table.
H
He
Li
Be
B
C
N
O
F
Ne
H: 1 valence electron
He: 2 valence electrons
Li: 1 valence electron
Be: 2 valence electrons
B: 3 valence electrons
C: 4 valence electrons
N: 5 valence electrons
O: 6 valence electrons
F: 7 valence electrons
Ne: 8 valence electrons
To identify the number of valence electrons for the given elements, we need to look at their position on the periodic table.
H (Hydrogen) is in Group 1, so it has 1 valence electron.
He (Helium) is in Group 18, so it has 2 valence electrons.
Li (Lithium) is in Group 1, so it has 1 valence electron.
Be (Beryllium) is in Group 2, so it has 2 valence electrons.
B (Boron) is in Group 13, so it has 3 valence electrons.
C (Carbon) is in Group 14, so it has 4 valence electrons.
N (Nitrogen) is in Group 15, so it has 5 valence electrons.
O (Oxygen) is in Group 16, so it has 6 valence electrons.
F (Fluorine) is in Group 17, so it has 7 valence electrons.
Ne (Neon) is in Group 18, so it has 8 valence electrons.
Remember that valence electrons are the electrons in the outermost energy level of an atom.
To identify the number of valence electrons for these elements on the periodic table, you can use the group number of each element as a guide. The group number tells you the number of valence electrons an element has, except for the transition metals.
Here are the number of valence electrons for each element:
H (Hydrogen): 1 valence electron
He (Helium): 2 valence electrons
Li (Lithium): 1 valence electron
Be (Beryllium): 2 valence electrons
B (Boron): 3 valence electrons
C (Carbon): 4 valence electrons
N (Nitrogen): 5 valence electrons
O (Oxygen): 6 valence electrons
F (Fluorine): 7 valence electrons
Ne (Neon): 8 valence electrons
To determine the number of valence electrons, refer to the periodic table and find the element. Locate the group number (vertical column) of the element, excluding the transition metals. The group number corresponds to the number of valence electrons for the element. For example, Oxygen (O) is in group 16, so it has 6 valence electrons.