Vocabulary
Vocabulary
Vocabulary
Early Models of the Atom
Atom's Structure and Periodical Table of Elements
100
The smallest particle into which an element can be divided and still be the same substance?
What is an atom?
100
Particles with no charge found inside the nucleus of an atom.
What are neutrons?
100
Atoms of the same element that have the same number of protons but different numbers of neutrons.
What are isotopes?
100
A chart listing all of the elements and basic information about each element.
What is the periodic table of the elements?
100
1 atomic mass unit
What is the approximate mass of a proton and a neutron?
200
A theory that explains the design and behavior of atoms.
What is the atomic theory?
200
Positively charged particles inside the nucleus of an atom.
What are protons?
200
A vertical column of elements on the periodic table.
What is a family?
200
Means "indivisible" or "not to be cut."
What is atom?
200
The chemical symbol for chlorine, oxygen, and hydrogen.
What is Cl, O H
300
The mass of an atom measured in amu.
What is atomic mass?
300
Negatively charged particles surrounding the nucleus of an atom.
What are electrons?
300
A horizontal row of elements on the periodic table.
What is a period?
300
Considered the father of nuclear physics because of his discovery about atomic structure.
Who is Ernest Rutherford?
300
The electrical charge of neutral atoms.
What is 0?
400
A unit developed to express the size of the particles in atoms.
What is the atomic mass unit (amu)?
400
The weighted average of the atomic masses of an element's naturally occurring isotopes?
What is the atomic weight?
400
Elements that have properties of both metals and nonmetals.
What are metalloids?
400
Expanded Rutherford's theory by proposing that electrons travel in specific paths around the nucleus and as the electrons moves to a closer path around the nucleus it loses energy.
Who is Niels Bohr?
400
Protons are positively charged and like charges repel one another. How is this problem overcome?
This repulsion is overcome by strong nuclear forces.
500
The number of protons in the nucleus of an atom.
What is the atomic number?
500
The sum of protons and neutrons in the nucleus of an atom.
What is the mass number?
500
The elements on the columns sandwiched between families 3 and 4 on the periodic table.
What are transition metals?
500
1. All substances are made of atoms. 2. Atoms cannot be divided into smaller particles. 3. Atoms cannot be created or destroyed. 4. Atoms of the same element are exactly alike, and atoms of different elements are different. 5. Atoms of two or more elements can combine to make new substances.
What is Dalton's atomic theory?
500
Family groups of elements on the periodic table share similar chemical properties because ...
they all have the same number of valence electrons in their outer energy level.
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