How can I tell how many neutrons there are in an element

Brainstorm how you could run a pcr reaction if you did not have access to a thermal cycler.

Which gases each make up less than 1 percent of Earth's atmosphere? Select three options. argon oxygen nitrogen water vapor carbon dioxide

Classify the following substances as a Bronsted-Lowry acid, Bronsted-Lowry base, Lewis acid, and/or Lewis base. HCl, BF_3, CCl_3, - HCH_2O, CH_3Cl-OCH_3, NH_3

A 6 kilogram cat is resting on top of a bookshelf that is 1 meters high. What is the cat's gravitational potential energy relative to the floor?

The diagram shows a ball resting at the top of a hill. Which statement best describes the energy in this system? The potential energy in the system is greatest at X. The kinetic energy in the system is greatest at X.

A intramuscular medication is given at 5.00mg/kg of body weight. What is the dose in grams for a 180-lb patient?

Nuclear fusion is the source of energy for stars. Besides hydrogen, which other element is most likely also common in stars?

Since the early 2000s, careers in the field of genetics have grown at a rapid pace. Which of these is a probable cause for this explosion of available and expanding jobs?

How many litres of 0.215 m NaCl contains 4.30 mol of this salt? Assume this solvent is H2O I'm confused on this question because little m is molality but when I looked this up on google, someone solved the problem assuming it was molarity

How can a neutral atom become a positively-charged particle?