Pre-Test
This is the smallest part of an element.
What is an atom?
Three subatomic particles.
What are protons, neutrons, and electrons?
The sum of protons and neutrons in the nucleus of an atom.
What is mass number?
Plum Pudding Model
Thompson's model with positive sphere and electrons scattered throughout
Neutrons are located outside of the nucleus. True or False?
False!
Objects with different charges do this when they come close to each other.
What is attract?
The name for the horizontal columns of elements on the periodic table
Groups
The number of protons in an atom of a certain element.
What is atomic number?
Name of scientist who discovered that atoms had a nucleus
Rutherford
Electrons are located outside of the nucleus. True or False?
True!
The charge of an electron
What is negative?
The name for vertical rows of elements on the periodic table
Periods
Explain what a Bohr Model looks like.
Nucleus in middle with number of protons and neutron; circles around the nucleus with dots for electrons.
Protons and neutrons are about the same size. True or False?
True!
The charge of a neutron
0, no charge
Atoms of different elements have different numbers of these.
What are protons?
The name of the electrons on the outer circle.
Valence electron
The name of the modern model of an atom
Electron Cloud Model
This is the smallest subatomic particle.
What is an electron?
The charge of a proton
What is neutral?
An atom with the same number of protons but different number of neutrons.
What is an isotope?
Mass number - atomic number = ______ __ ________.
What is the numer of neutrons?
First scientist to suggest atoms existed.
Democritus