Scientists
Who was the first person to suggest that matter might be made of atoms?
Democritus
Where are protons located in an atom? (Be specific)
In the Nucleus
Protons and Electrons
Which subatomic particle is responsible for changing the mass of an atom?
Neutrons
Where are the nonmetals located on the periodic table?
On the right side
JJ Thomson's Cathode Ray Tube experiment led to the discovery of which subatomic particle?
The electron
Where are electrons located in an atom?
Electron Cloud
OR
Energy rings, levels, shells, orbitals
An atom has 12 protons, 12 neutrons, and 12 electrons. Is this an atom or an ion?
Atom
An isotope is a different variation of an atom based on what measurement?
Atomic mass
The modern periodic table is organized by _________________.
Atomic Number
OR
Number of Protons
The Gold Foil Experiment
Which two subatomic particles are added together to find the mass of an atom?
Protons and Neutrons
What subatomic particle is gained or lost to create an ion?
The electron
An atom has 9 protons, 9 neutrons, and 10 electrons. What is the atomic mass of this atom?
18
The groups or columns on the periodic table tell us how many ____________________ there are in an atom of each element.
Valence electrons
JJ Thomson's atomic model is sometimes called the __________________________.
Plum Pudding Model OR Chocolate Chip Cookie Model
Why do we not calculate the mass of electrons into the atomic mass for an atom?
They are too small
What is exact charge of an ion that has 5 protons, 5 neutrons, and 7 electrons?
2-
What does the number represent in the following representation?
C - 14
The atomic mass
How many valence electrons are there in an atom of Carbon (C)?
4
Name the scientist who created the model where electrons traveled in a defined path while orbiting the nucleus of an atom.
Niels Bohr
Where are valence electrons located in an atom?
On the outermost energy ring
How many protons and electrons does the following ion have?
Mg2+
Protons = 12
Electrons = 10
Isotopes are different variations of an element, including make some elements __________________.
Radioactive
The elements in Column 18 or Group 8 are called the what?
The Noble Gases