Question

select the correct boxes. which two elements have the same number of valence electrons? element atomic number barium 56 neon 10 silicon 14 carbon 6

Explanation:

Step1: Determine electron - configurations

Use the atomic number to find electron - configurations.

Step2: Identify valence electrons

For barium (atomic number 56), electron - configuration is [Xe]6s², 2 valence electrons. Neon (atomic number 10), [He]2s²2p⁶, 8 valence electrons. Silicon (atomic number 14), [Ne]3s²3p², 4 valence electrons. Carbon (atomic number 6), [He]2s²2p², 4 valence electrons.

Answer:

Silicon, Carbon