input with options: Answer the following question given this paragraph: Atoms have a mass that is based largely on the number of protons and neutrons in their nucleus. Q: The mass of atoms is based on the number of protons and neutrons in what? A:
OPTIONS:
- electrons
- molecules
- components
- nucleus
output: nucleus

Q: Answer the following question given this paragraph: As you learned in Chapter 1 "Introduction to Chemistry", the mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom. The mass number is an integer that is approximately equal to the numerical value of the atomic mass. Although the mass number is unitless, it is assigned units called atomic mass. Q: What number is the sum of the numbers of protons and neutrons present in the nucleus of an atom? A:

OPTIONS:
- nuclear number
- combined number
- mass total
- mass number

A: mass number

input: OPTIONS:
- typical elements
- noble gases
- reactive elements
- native elements Now, answer this question: Answer the following question given this paragraph: Native elements contain only atoms of one type of element. They are not combined with other elements. There are very few examples of these types of minerals. Some native elements are rare and valuable. Gold, silver, sulfur, and diamond are examples. Q: What do you call elements that contain only atoms of one type of element? A:
A:
output: native elements

Answer the following question given this paragraph: The eye of a person with myopia is longer than normal. As a result, images are focused in front of the retina ( top left ). A concave lens is used to correct myopia to help focus images on the retina ( top right ). Farsightedness, or hyperopia, occurs when objects are focused in back of the retina ( bottom left ). It is corrected with a convex lens ( bottom right ). Q: What part of a person with myopia is longer than normal? A:

OPTIONS:
- arm
- leg
- neck
- eye

Answer: eye

Problem: OPTIONS:
- nono particle
- kilocalorie
- xerophyte
- radiostope
Q: Answer the following question given this paragraph: A radioactive isotope, or radioisotope, has atoms with unstable nuclei. The unstable nuclei naturally decay, or break down, by losing energy and particles of matter to become more stable. If they gain or lose protons as they decay, they become different elements. Over time, as the nuclei continue to decay, less and less of the original radioisotope remains. Q: What is another name for a radioactive isotope? A:
Answer: radiostope

Answer the following question given this paragraph: The polymerase chain reaction is a way of making copies of a gene. It uses high temperatures and an enzyme to make new DNA molecules. The process keeps cycling to make many copies of a gene. Q: The polymerase chain reaction is a way of making copies of what? A:

OPTIONS:
- an enzyme
- a method
- a form
- a gene

Answer:
a gene