Question

sodium (na) boron (b) gallium (ga) carbon (c) tin (sn) chlorine (cl)
same valence electrons
as silicon (si)
same energy levels as
silicon (si)
more
protons
than
silicon
(si)
less
protons
than
silicon

Explanation:

Step1: Determine valence electrons of Si

Silicon (Si) has 4 valence electrons. Elements in the same group (column) of the periodic table have the same number of valence electrons. Carbon (C) is in group 14 (same as Si) and has 4 valence electrons. Tin (Sn) is also in group 14 and has 4 valence electrons. But we need to check the proton - number condition.

Step2: Check proton - number condition for "More protons than Si"

Silicon (Si) has 14 protons. Tin (Sn) has 50 protons (\(50>14\)).

Step3: Check energy - level (period) condition for "Same energy levels as Si"

Silicon (Si) is in period 3. Gallium (Ga) is in period 4, sodium (Na) is in period 3. Sodium (Na) has 11 protons (\(11 < 14\)), so it doesn't meet the "More protons than Si" for the energy - level part.

Step4: Check proton - number condition for "Less protons than Si"

Boron (B) has 5 protons (\(5<14\)) and it has 3 valence electrons. Carbon (C) has 6 protons (\(6 < 14\)) and 4 valence electrons.

Answer:

• Same valence electrons as silicon (Si) and more protons than silicon (Si): Tin (Sn)
• Same energy levels as silicon (Si) and more protons than silicon (Si): (No element in the given list meets this as Ga has more protons but is in a higher period and Na has fewer protons)
• Same valence electrons as silicon (Si) and less protons than silicon (Si): Carbon (C)
• Same energy levels as silicon (Si) and less protons than silicon (Si): Sodium (Na) (but it has 1 valence electron, actually, if we consider only the proton - number and period condition for the last cell, with the given elements, if we assume some error in the valence - electron part for the last cell (maybe a mis - understanding of the problem setup), but based on strict valence - electron count (4 for Si), there is an issue. If we just go by period (energy level) and proton - count:
• For "Same energy levels as Si (period 3)" and "Less protons than Si (14 protons)": Sodium (Na) (11 protons, period 3)