4. Which statement is true about alkali metals?

A. Some of them explode when exposed to water.

B. They are not conductors of heat or electricity.

C. They are not very reactive.

D. They are in group 18 of the periodic table

The total mass of the protons in an atom of gold-198 is approximately (1) 79 atomic mass units (2) 119 atomic mass units (3) 198 atomic mass units (4) 277 atomic mass units

Which fraction of an original 20.00-gram sample of nitrogen-16 remains unchanged after 35.65 seconds?

Whats your favorite form of precipitation why

Which of the following elements has the largest atomic size? S, Ba, Po, Ca

4 Compared to the energy and charge of the electrons in the first shell of a Be atom, the electrons in the second shell of this atom have (1) less energy and the same charge (2) less energy and a different charge (3) more energy and the same charge

List at least two chemical reactions that resulted in a yellow, orange, or red precipitate. For these reactions, list the possible chemical name of the precipitate.

You place air in a sealed can at stp. ypu triple its absolute temperture (K) while leaveing the volume constant. what happenes to the pressure

A current of 10.4 a is applied to 1.25 l of a solution of 0.552 m hbr converting some of the h + to h2 (g), which bubbles out of solution.

What is a greenhouse gas?

Which statement best describes a mole?