Which of the following describes the element .(Select all that apply.)reacts with alkali metals to form saltsforms an ion with a charge of 2is one of the group of the least reactive elements forms a cation that is isoelectronic with a noble gasis very reactive as a metal consists of diatomic molecules in elemental form

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

How hot is the suns corona? (integrated science)