Question

1. refer to the bohr models above: element c is in period _. element b is in period _. element b has (lower, higher) shielding effect compared to element c. element a is in group _. element b is in group _. element c is in group ___.

Explanation:

The number of electron - shells in an atom is related to its period number in the periodic table, and the number of valence electrons is related to its group number. Shielding effect is influenced by the number of inner - shell electrons. For the Bohr models shown:

• Element A has more electron - shells than Element B, so it is in a higher period. Since the outermost electrons are more shielded from the nucleus as the number of inner - shell electrons increases, Element B has a lower shielding effect compared to Element C as it has fewer electron - shells. Element C has more electron - shells than Element B, so it is in a higher period. Counting the outermost electrons, Element A is in group 6, Element B is in group 2, and Element C is in group 6.

Answer:

Element A is in group 6.
Element B is in group 2.
Element A is in a higher period.
Element B has a lower shielding effect compared to Element C.
Element C is in a higher period.