1.
The smallest particle of an element that retains the element’s properties
2.
Small positively charged center of the atom
3.
Particles with an electric charge of +1
4.
Electrically neutral particles in the nucleus
5.
Particles with an electric charge of -1
6.
Scientist have inferred that protons and neutrons are composed of smaller particles
7.
The area around the nucleus of an atom where electrons are most likely to be found
8.
The number of protons in an atom’s nucleus is equal to
9.
An atom is the sum of the number of protons and the number of neutrons in the nucleus of the atom
10.
Atoms of the same element that have different numbers of neutrons
11.
An element is the weighted average mass of all naturally occurring isotopes of an element measured in atomic mass units
12.
The element are arranged by increasing atomic number not atomic mass and by periodic changes in physical and chemical properties
13.
The horizontal rows of elements in the periodic table
14.
The vertical columns in the periodic table
15.
Consists of the chemical symbol of an element surrounded by dots to represent the number of electrons in the outermost energy level
