Identify the number of valence electrons for these elements on the table.
Na
Mg
Al
Si
P
S
Cl
Ar
K
Ca
Na - 1 valence electron
Mg - 2 valence electrons
Al - 3 valence electrons
Si - 4 valence electrons
P - 5 valence electrons
S - 6 valence electrons
Cl - 7 valence electrons
Ar - 8 valence electrons
K - 1 valence electron
Ca - 2 valence electrons
To identify the number of valence electrons for these elements on the table, we need to look at their position in the periodic table. The valence electrons are the electrons located in the outermost energy level of an atom.
Here are the number of valence electrons for each element:
Na (Sodium) - Na is in Group 1 (1A), so it has 1 valence electron.
Mg (Magnesium) - Mg is in Group 2 (2A), so it has 2 valence electrons.
Al (Aluminum) - Al is in Group 13 (3A), so it has 3 valence electrons.
Si (Silicon) - Si is in Group 14 (4A), so it has 4 valence electrons.
P (Phosphorus) - P is in Group 15 (5A), so it has 5 valence electrons.
S (Sulfur) - S is in Group 16 (6A), so it has 6 valence electrons.
Cl (Chlorine) - Cl is in Group 17 (7A), so it has 7 valence electrons.
Ar (Argon) - Ar is in Group 18 (8A), so it has 8 valence electrons.
K (Potassium) - K is in Group 1 (1A), so it has 1 valence electron.
Ca (Calcium) - Ca is in Group 2 (2A), so it has 2 valence electrons.
Remember that the number of valence electrons determines the reactivity and chemical properties of the elements.
To determine the number of valence electrons for an element, you can refer to its position on the periodic table. Valence electrons are the electrons in the outermost energy level of an atom.
1. Na (Sodium) - Sodium is in group 1 of the periodic table. Elements in group 1 have 1 valence electron.
2. Mg (Magnesium) - Magnesium is in group 2 of the periodic table. Elements in group 2 have 2 valence electrons.
3. Al (Aluminum) - Aluminum is in group 13 of the periodic table. Elements in group 13 have 3 valence electrons.
4. Si (Silicon) - Silicon is in group 14 of the periodic table. Elements in group 14 have 4 valence electrons.
5. P (Phosphorus) - Phosphorus is in group 15 of the periodic table. Elements in group 15 have 5 valence electrons.
6. S (Sulfur) - Sulfur is in group 16 of the periodic table. Elements in group 16 have 6 valence electrons.
7. Cl (Chlorine) - Chlorine is in group 17 of the periodic table. Elements in group 17 have 7 valence electrons.
8. Ar (Argon) - Argon is in group 18 of the periodic table. Elements in group 18 have 8 valence electrons, except for helium which has 2.
9. K (Potassium) - Potassium is in group 1 of the periodic table. As mentioned earlier, elements in group 1 have 1 valence electron.
10. Ca (Calcium) - Calcium is in group 2 of the periodic table. Elements in group 2 have 2 valence electrons.
Remember that for transition metals (groups 3-12), the number of valence electrons can vary.