Science: Vocabulary Review Flashcards
A capital letter or a combination of a capital letter and a small letter that is used to represent an element is called a ____.
chemical symbol
The horizontal rows of elements are called ____.
periods
An average of the masses of all the isotopes that occur in nature for an element is the ____.
mass number
Vertical columns of elements are called ____.
groups
Elements in the middle of the periodic table, groups 4 through 7, are called the ____.
transition elements
The number of protons in an atom is the ____.
atomic number
The center of an atom, where protons and neutrons are located is the ____.
nucleus
A total count of the neutrons and protons in an atom is the ____.
mass number
Atoms of the same element but with different numbers of neutrons are ____.
isotopes
Elements that are found on the left side of the periodic table are ____.
metals
Elements that have some propertied of both metals and nonmetals are ____.
metalloids
The particles that move about the nucleus and have a negative charge are ____.
electrons
The region around the nucleus occupied by electrons is an ____.
electron cloud
A chart that shows the classification of elements is called the ____.
periodic table
