How to predict which elements are reactive under normal conditions?

In the atomic random what units of measurement are used for this trend?

Calcium reacts with sulfur forming calcium sulfide. what is the theoretical yield (g) of cas (s) that could be prepared from 1.6 g of ca (s) and 4.25 g of sulfur (s) ? enter your answer with two decimal places. do not type units with your answer.

Identify the Bronsted-Lowry acid-base pair in the following equation: HCN + NO2 - ⇌ CN - + HNO2

A sample of N2O3 (g) has a pressure of 0.046 atm. The temperature (in K) is then doubled and the N2O3 undergoes complete decomposition to NO2 (g) and NO (g).

Which of the notations below is another way to write the name of the following nuclide? A. iodine-53 B. iodide-53 C. iodide-127 D. iodine-127

How many valence electrons are in atom of sulfur?

My sister needs this answered! Donald is creating an experiment to determine if fertilizer affects plant color. He makes this statement: "If each plant receives a different amount of fertilizer, then the plant's color intensity will change.

What would happen to life if earth were in a different location within the solar system

Substance that undergoes a change in a chemical reaction is a. a product c. a reactant. b. a chemical. d. an enzyme.

List the number of protons, neutrons, and electrons in Iodine-127. (atomic number is 53)