What element has 81 protons in the nuclei of its atoms?

A. Platinum

B. Uranium

C. Lead

D. Thallium

Give an example of an industry i n which Chemistry is used and explain how it is.

Why should the numbers and types of atoms be the same on both sides of your chemical equation

Which of the following is a substance made up of only one type of atom?

What is the ph of 1.2 time 10 to the negitive 2

Why is the radius of a positive ion always less than the radius of its neutral atom? (A) the nucleus pulls the remaining electrons in closer. (B) The number of principal energy levels is always reduced.

How mant atoms are in 3N2

The type of nuclear decay an unstable nucleus will undergo depends on its ratio of neutrons to protons. The radioisotope cobalt-65 has a ratio of neutrons to protons of 1.41, which is too high for a nucleus of this size.

1.87 $/gal to dollars per liter, Express your answer using three significant figures.

What can a student do to increase the force of attraction of a magnet on an iron block?

Which elements can react to produce a molecular compound?