Answer:
A: Elements in the same group share the same number of valence electrons.
D: Elements in the same group share the same reactive properties.
Explanation:
A periodic group is simply the arrangement of elements vertically on the periodic table.
There are about 8 main groups of elements on the periodic table.
- Elements in the same group have the same number of valence electrons. This is usually observed in their group numbers.
- Due to this, they all share the same chemical properties which makes them react the same way.
- Usually, the number of atoms shell increases down the group.
- Across a period, elements share the same number of orbitals in their structure.
- No two elements on the periodic table shares the same number of total electrons.
