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

Elements in the same group have the same number of valence electrons. Carbon (C, atomic number = 6) has an electron - configuration of 1s²2s²2p², with 4 valence electrons. Silicon (Si, atomic number = 14) has an electron - configuration of 1s²2s²2p⁶3s²3p², also with 4 valence electrons. Barium (Ba, atomic number = 56) has 2 valence electrons, and neon (Ne, atomic number = 10) has 8 valence electrons.

Answer:

Silicon, Carbon