As the elements in group 17 are considered in order of increasing atomic number, the chemical reactivity of each successive element
(1) decreases
(2) increases
(3) remains the same

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?

In general metals get as you move from left to right across the periodic table.

How is an endothermic reaction identified