Question

Из предложенных элементов K,H,Ca,Zn,Se,He,Kr,P,Xe выберете те,которые принадлежат к одной группе.

Answer 1

1-ая группа: H, Na
2-ая группа:Ca, Zn
5-ая группа: P
6-ая группа: Se
8-ая группа: He, Xe, Kr

Answer 2

Elements Belonging to the Same Group

The elements K (Potassium), Rb (Rubidium), and Cs (Cesium) belong to the same group in the periodic table. They are all alkali metals and are located in Group 1 of the periodic table. These elements share similar chemical properties due to their placement in the same group.

Conclusion

Based on the information provided, the elements K, Rb, and Cs belong to the same group in the periodic table.