What is the average atomic mass of sodium

Question 1 Is the following question true or false All of today's continents were part of one large land mass 225 million years ago Question 2 Is the following statement true or false The moving continents has had little impact on the distribution

What is thermal energy? a: the average overall volume of a system b: the total number of molecules in a system c: the kinetic energy of particles in a system d: the measure of temperature in a system

Knowing what you know about the nucleus and the subatomic particles in the nucleus, what do you think is the charge of the nucleus of an atom?

Which of the following terms best describes the nucleus of a radioactive element? a. unchanging b. explosive c. unstable d. energized

What is the molarity of the solution that results when 25.0 mL of 0.513 M solution is diluted to 500.0 mL

Is a whale a abiotic or biotic

If the half-life of hydrogen-3 is 11.8 years, after two half-lives the radioactivity of a sample will be reduced to one-half of the original amount. If the half-life of hydrogen-3 is 11.

If element X has 25 protons, how many electrons does it have?

How much work is done to raise a 20N box 4m?

Which of the following lists the types of single substances? (Select only one answer) Group of answer choices elements and mixtures suspensions, solutions, and colloids elements, compounds, and mixtures elements and compounds