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8th grade-2.1

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1.
1 point
People begin to wonder about matter more than ______.
2.
1 point
They named these particles ________, a term that means "cannot be divided."
3.
1 point
Today, scientists will not accept a theory that is not supported by _______________.
4.
1 point
_________ is the use of knowledge gained through science to make new products or tolls people can use.
5.
1 point
A __________ is a statement that can be tested.
6.
1 point
A long period passed before the _________ about the atom were developed further.
7.
1 point
Scientist came to realize that all _________ is made up of elements.
8.
1 point
An _________ is matter made of atoms of only one kind.
9.
1 point
_________, an English schoolteacher in the early nineteenth century, combined the idea of elements with the Greek theory of the atom.
10.
1 point
Dalton's ________ of the atom was tested in the second half of the nineteenth century.
11.
1 point
In 1870, the English scientist _____________ did experiments with a glass tube that had almost all the air removed from it.
12.
1 point
An _________ is a piece of metal that can conduct electricity.
13.
1 point
One electrode, called the ___________, has a positive charge.
14.
1 point
The other, called the cathode, has a ___________ charge.
15.
1 point
Crookes ___________ that the green glow in the tube was caused by rays, or streams of particles.
16.
1 point
Crookes's tube is known as a cathode-ray tube, or _____.
17.
1 point
Thomson then repeated the CRT experiment using different metals for the cathode and different ____ in the tube.
18.
1 point
These negatively charged particles are now called __________.
19.
1 point
___________ can be bits of information you gather with your senses.
20.
1 point
A __________ variable is the factor, or outcome, that will be measured in an experiment.
21.
1 point
In ________, Ernest Rutherford and his coworkers began an experiment to find out if Thomson's model of the atom was correct.
22.
1 point
Alpha particles come from unstable __________.
23.
1 point
Rutherford was shocked when his ___________ rushed in to tell him that some alpha particles were veering off at large angles.
24.
1 point
A __________ is a positively charged particle.
25.
1 point
It was proposed that another particle must be in the _________ to account for the extra mass.
26.
1 point
The ____________ of an element is the number of protons in the nucleus of that element.
27.
1 point
A particular type of atom can have a varying number of ________________ in its nucleus.
28.
1 point
Most atoms of _________ have six neutrons.
29.
1 point
_________ are atoms of the same element that have different number of neutrons.
30.
1 point
The ________ of an isotope is the number of neutrons plus protons.
31.
1 point
Many atomic nuclei are stable when they have about the same number of protons and ________.
32.
1 point
In these nuclei, ___________ builds up.
33.
1 point
The release of nuclear particles and energy is called _________.
34.
1 point
When the particles that are ejected from a nucleus include ______, the atomic number of the nucleus changes.
35.
1 point
The changing of one element into another through radioactive decay is called ____________.
36.
1 point
Transmutation is occurring in most of your ______ right now.
37.
1 point
The atomic number of ________ is 95, so americium has 95 protons.
38.
1 point
A beta particle is a high-energy _________ that comes from the nucleus, not from the electron cloud.
39.
1 point
The electron, or beta particle, is released with a large amount of ____________.
40.
1 point
Because a neutron has been changed into a proton, the nucleus of the element has an additional ___________.
41.
1 point
Half-lives, which are different for each __________, range in length from fractions of a second to billions of years.
42.
1 point
Scientists have found the study of radioactive decay useful in determining the age of artifacts and ___________.
43.
1 point
In a living organism, the amount of _________ remains in constant balance with the levels of the isotope in the atmosphere or ocean.
44.
1 point
When __________ want to determine the age of rocks, they cannot use carbon dating.
45.
1 point
Waste products from processes that involve __________ are a problem because they can leave isotopes that still release radiation.
46.
1 point
One such site is in _________, where nuclear waste is buried 655 miles below the surface of Earth.
47.
1 point
Scientists now create new elements by smashing atomic _______ into a target element.
48.
1 point
The new element is called a ___________ element because it is made by humans.
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