Atoms
What is the subatomic particle with a negative charge?
electron
How many electrons can occupy the first energy level?
Two
What are the horizontal rows of elements in the periodic table called?
Periods
Name the only element in group 1 that is not a metal.
Hydrogen
What elements are shiny and conduct heat and electricity well?
Metals
What is located in the nucleus and carries a neutral charge?
Neutron
What is the maximum number of electrons that can occupy the second energy level?
Eight
What are the vertical columns of elements in the periodic table called?
Groups
What is group 17 called?
Halogens
Sometimes an element comes in a form that contains more neutrons. What is the term that describes this condition?
Isotope
The protons and neutrons are located here.
Nucleus
What is an electron that is found in the outermost shell of an atom and that determines the atom's cheimcal properties.
Valence Electron
What information is provided by the Atomic Number?
The number of protons. (and electrons)
How many valence electrons does oxygen have, and how many more would it like to be stable?
Oxygen has 6 valence electrons and it would like 2 more.
What do Phosphorus, Arsenic and Antimony all have in common?
They all have 5 valence electrons.
Where are the electrons located?
The electron cloud
In a neutral atom, the number of electrons will equal the number of what?
Protons
What does the atomic mass number represent?
The average mass of all the isotopes of that particular element.
Why are noble gases inert? (non-reactive)
They have full outermost shells.
How many neutrons does Sodium have?
12
What is the definition of an atom?
The smallest particle of an element that holds all the characteristics of the element.
Cs has an atomic number of 55. How many valence electrons does it have?
One
What is the term used to describe group 18?
Noble gases
What is the group of elements called that contain properties of both metals and nonmetals?
Semiconductors/metalloids
Who has been credited with arranging the elements on the Periodic Table in the positions we use today?
Dmitri Mendeleev