How many protons are in the nucleus of an atom with an atomic number of 20

A student made an initial 1:5 dilution of protein lysate. Then 2mL of that was added to 8mL of water. Lastly, the student made a 1:20 dilution of the second tube. What is the final dilution of protein lysate.

Use the periodic table to identify the number of core electrons and the number of valence electrons in each case below. Potassium (K) : 1s22s22p63s23p64s1

When elements combine to form compounds, chemical bonds form between the atoms. Bonds form when atoms share or exchange in a way that gives each atom a complete outer shell. electrons protons neutrons nucleus

Why is a liquid able to flow

Students of different ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle. Which on is the Independent variable, dependent variable, and controlling variables?

Which of the following is NOT true of nitrogen fixation? (A) it is a process that occurs exclusively in some species of prokaryotes (B) it sometimes occurs in bacteria that are mutualistic symbionts in plant roots (C) it is the metabolic process

What two pieces of information do u need to describe force

Why are the atomic masses for most elements not whole numbers?

An aqueous solution is 0.387 m in hcl. what is the molality of the solution if the density is 1.23 g/ml?

Carbon monoxide reacts with oxygen to form carbon dioxide. 2 CO (g) + O2 (g) → 2C02 (8) In a 1.00 L flask, 3.40 atm of CO reacts with 2.60 atm of O2. Assuming that the temperature remains constant, what is the final pressure in the flask? 4.30 atm 2.