Respuesta :
Calcium belongs to the alkaline earth metal group. Within a group, the melting point decreases from top to bottom. This is because the as the atomic radii increases the outer valence electrons are shielded by the inner electrons and experience a lower nuclear attraction. As a result the bonds can be broken easily which lowers their melting point.
The three elements below Calcium ib Group II A which have a lower melting point are: Strontium (Sr), Barium (Ba) and Radium (Ra)
The three elements have lower melting point than calcium should be Strontium (Sr), Barium (Ba) and Radium (Ra)
What is calcium?
It refer to the alkaline earth metal group. In this, melting point reduced from top to bottom. This is due to the atomic radii rising the outer valence electrons should be shielded via the inner electrons and experience a lower nuclear attraction. Due to this, the bonds can be broken easily which lowers their melting point.
Learn more about calcium here: https://brainly.com/question/18515239
