Science Atoms Test
Terms in this set (66)
A capital letter or combination of a capital letter and a small letter and a small letter that is used to represent an element is called an...
The horizontal rows of elements are called...
Average atomic Mass
An average of the masses of all the isotopes that occur in nature for an element is the...
Vertical columns of elements called...
Elements in the middle of the periodic table, groups 4 through 7, are called the...
The number of protons in an atom is the...
Protons and neutrons are composed of...
The center of an atom where protons and neutrons are located is the...
A total count of the neutrons and protons in an atom is the.
Atoms of the same element but with different but with different numbers of neutrons are...
Elements that are found on the left side of the periodic table are...
Elements that have some properties of both metals and nonmetals are...
The particles that move about the nucleus and have a negative charge are...
The region around the nucleus occupied by electrons is...
A chart that shows the classification of elements is called the..
What is the charge of a Proton?
What is the charge of a Neutrons?
What is the charge of a Electron?
Where is the proton?
Where is the electron?
Where is the neutron?
What is the charge of an electron?
Which scientist used the Cathode Ray-Tube to learn more about atoms?
The electron arrangement
What determines an elements chemical properties?
A positive charge
What is the charge of the nucleus?
The number of protons in the nucleus
The order of elements in the periodic table is based on their atomic number which is equal to......
What do protons determine for the atom
What do electrons determine for the atom?
How many quarks have been found?
Which sub atomic particle moves the fastest?
How many electrons can the 1st energy level hold?
How many electrons can the 2nd energy level hold?
How many electrons can the 3rd energy level hold?
Which scientist discovered atoms and can join together to form new substances?
Lord Ernest Rutherford
Which scientist used the gold foil apparatus to discover protons?
Atomic number/ number of protons
How is the periodic table organized?
Metals, Nonmetals, and Metalliods
What are the 3 classifications of the periodic table?
The energy number.
What doest the period number tell you?
Boron, Silicone, Arsenic, Germanium,Antimony, Polonium.
What are the 6 metalloids?
What are columns on the periodic table called?
What are rows on the periodic table called?
Matter that is composed of one type of atom
The basic unit of a chemical element.
amu-atomic mass unit
What is the unit of measurement used for atomic particles?
the atomic number
What is the number of protons equal to?
The Mass Number
What is the number of protons and neutrons added together in the nucleus of the atom?
repeated in a pattern
What does periodic mean?
Russian, Dmitri Mendeleev
Who discovered the pattern of atomic masses?
what does a period represent?
how much energy does period-1 have for that row?
Small, dense, POSITIVELY CHARGED, center of the atom, contains most of the atoms mass.
protons, and electrons
What does the atomic number tell you?
Represents the most likely location of an electron, electrons move very fast.
closer to the nucleus
lower energy level
farther from the nucleus
higher energy level
Isotopes of an element have the same atomic number, and number of protons, but different mass, and number of neutrons.
Explain how the isotope of an element is alike and how are they different?
mass number minus atomic number
How do you find the number of neutrons?
it becomes a completely different atom, with different porperties.
What happens when the number of protons in an atom changes?
He had the atomic theory of matter. All elements are made of atoms, you can not split an atom. Atoms, compounds, and elements.
Discovered the electron. Worked with a gas discharge tube when he discovered the cathode ray.
He used a gold foil to study particle movement. He found that atoms were mostly empty space. He knew the nucleus was positive because it repelled.
Created a model of an atom. Studied electron levels.
Different elements, 2 or more
What are compounds made of?
Negatively charged particles
What are cathode rays made of?
Different energy levels
How do electrons in the same atom differ?
Would an electron have to absorb or release energy to jump from the second energy level to the third energy level?
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