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35 Cards in this Set
- Front
- Back
electron |
negative charge |
|
atom |
basic unit of matter |
|
energy levels |
three-dimensional orbits |
|
Niels Bohr |
drew first picture of atom |
|
electron cloud |
electrons reside here |
|
molecule |
atoms bonded |
|
1st energy level |
inner energy level |
|
John Dalton |
developed atomic theory |
|
number of energy levels |
seven |
|
proton |
positive charge |
|
The basic atom is neutral. |
true |
|
Density equals volume divided by mass. |
true |
|
Buoyancy is a general property of matter. |
false |
|
Most of the atomic mass is in the nucleus. |
true |
|
Valence electrons determine to what extent an atom can combine. |
true |
|
Electrons move in a single plane. |
false |
|
The 3rd energy level can hold 18 electrons. |
true |
|
The atomic mass of hydrogen is one. |
true |
|
The four natural elements are fire, air, earth, and water. |
true |
|
A molecule is made up of two or more elements. |
true |
|
How many electrons are in the 1st energy level of each atom? |
two |
|
How many electrons is each atom sharing? |
two |
|
How many protons are in each nucleus? |
eight |
|
How may electrons does each atom have in its second energy level? |
eight |
|
How many total electrons does each atom have? |
10 because they share two each |
|
The particle which is opposite in charge to the electron is the |
proton |
|
The state of matter in which the molecules are closest together is the ____________ phase. |
solid |
|
protons are found in the |
nucleus. |
|
A molecule of water is made up of |
three atoms |
|
The maximum number of energy levels in an atom is |
seven |
|
A molecule is formed when two or more atoms are |
combined. |
|
The particle that determines the mass of the atom, along with the proton, is |
neutron |
|
The force causing an object to float is called |
buoyancy |
|
Nearly all the mass of an atom is found in the |
nucleus |
|
The idea that all matter is made up of very tiny particles called atoms is the |
atomic theory |