Which of the following pairs of properties of Akali metals decreases down the group

Match each object to its description: a. coma of a comet b. comet tail c. oort cloud haze surrounding a nucleus created by solar wind. hypothetical sphere around the solar system

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17