A sample of which radioisotope emits particles havingthe greatest mass? A) 137Cs B) 53Fe C) 220Fr D) 3H

What are three ways simple machines give us an advantage

Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic

Give two reasons why quarrying is bad for the environment?

A. Find the pH and pOH of a solution having 6.6 x 10-6 M

Which best explains how Dmitri Mendeleev organized elements in his periodic table? O A. Elements were ordered based on their discovery date. O B. Elements were ordered based on their economic value. O C.

How did coroners handle their responsibilities in the early 1900s? Why was there a need for significant change in the job?

Which of the following is the best indication that a chemical change has taken place? a. The matter changes color. b. A mixture separates into layers. c. The change is reversible. d. The shape of the substance changes.

This is not lost in a chemical Reaction (4 letter word second letter is A)

Which type of soil holds the least water

Eq-43 which type of fire extinguisher should be onboard a vessel with a permanently installed fuel tank