Structure of the Atom
Masses of Atoms
The Periodic Table
Vocab I
Vocab !!
100
The positively charged center of the atom.
What is the nucleus?
100
Total count of the neutrons and protons in an atom.
What is the mass number?
100
An organization of elements by the number of protons in each.
What is the Periodic Table of Elements?
100
The center of an atom where protons and neutrons are located.
What is the nucleus?
100
A capital letter or a combination of a capital letter and a small letter that is used to represent an element.
What is its symbol?
200
This particle is NOT found in the nucleus of an atom.
What is an electron?
200
Boron-10 has one less _____________ than Boron-11.
What is neutron?
200
In the modern periodic table, elements are arranged according to increasing ________________.
What is atomic number?
200
A chart that shows the classification of the elements.
What is the periodic table?
200
The number of protons in an atom.
What is the atomic number?
300
Neutral particle in the nucleus of an atom.
What is a neutron?
300
The atomic mass of Hydrogen.
What is 1.008
300
A term for a pattern that repeats.
What is periodic?
300
The particles that move about the nucleus and have a negative charge.
What are electrons?
300
A total count of the neutrons and protons in an atom.
What is the mass number?
400
A negatively charged particle in an atom.
What is an electron?
400
Two elements with the same number of protons but a different number of neutrons.
What are isotopes?
400
Chemist who arranged elements by atomic mass.
Who is Mendelev?
400
Vertical columns of elements are called this.
What are groups?
400
Elements that have some properties of both metals and nonmetals.
What are metalloids?
500
The atomic number is the number of ____________ in the nucleus of an atom.
What is protons?
500
The weighted average mass of all the known isotopes for an element.
What is the average atomic mass?
500
Physicist who organized the modern periodic table by atomic number.
Who is Moseley?
500
The horizontal rows of elements are called this.
What are periods?
500
Elements in the middle of the periodic table, groups 4 through 7.
What are transition metals?
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