What is the meaning of matter? ​

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i

How is an endothermic reaction identified