How many valence electrons does strontium (sr) have?

This graph gives information on changes in sea ice extent in the arctic ocean over a 30-year span. the overall trend shows in the ice extent. to address the trend, scientists need to ask themselves, one direct consequence of the trend is that

What does earth’s rotation on its axis cause? the tides night and day passing of years phases of the moon

The molecular formula for caffeine is cshion402. which of the following elements is not found in caffeine?