To determine which two elements have the same number of valence electrons, begin by identifying the number of valence electrons for each element based on their atomic numbers and positions in the periodic table.
1. Barium (56)
- Barium is in group 2 of the periodic table.
- Elements in group 2 have 2 valence electrons.
- Therefore, barium has 2 valence electrons.
2. Neon (10)
- Neon is in group 18 of the periodic table.
- Elements in group 18 have a full outer shell of 8 valence electrons (inert gas configuration).
- Therefore, neon has 8 valence electrons.
3. Silicon (14)
- Silicon is in group 14 of the periodic table.
- Elements in group 14 have 4 valence electrons.
- Therefore, silicon has 4 valence electrons.
4. Carbon (6)
- Carbon is also in group 14 of the periodic table.
- Like silicon, elements in group 14 have 4 valence electrons.
- Therefore, carbon has 4 valence electrons.
Next, compare the number of valence electrons for each element:
- Barium has 2 valence electrons.
- Neon has 8 valence electrons.
- Silicon has 4 valence electrons.
- Carbon has 4 valence electrons.
From the comparisons:
- Silicon (14) and Carbon (6) both have 4 valence electrons.
Therefore, the two elements with the same number of valence electrons are:
- Silicon (14)
- Carbon (6)
