Atoms
Most of the mass of an atom is located where?
The nucleus.
The atomic number tells us what?
The number of protons (or electrons).
What are rows on the period table called?
Periods.
What are columns on the periodic table called?
Groups (or families).
What determines where an element is located on the periodic table?
Atomic number (number of protons).
What subatomic particle has no charge?
A neutron.
What does the atomic mass tell us?
The amount of protons and neutrons.
Approximately how many elements on the periodic table are metals?
3/4 (three-fourths).
Where on the periodic table are most nonmetals located?
On the right.
What element has an atomic number of 96?
Curium.
What are the three subatomic particles located in an atom?
Electrons, Neutrons, and Protons.
What is the one or two letter abbreviation of an element called?
(Example: Nitrogen is N).
Chemical symbol.
What is group 17 known as?
Halogens.
What gives groups 13 through 16 their names?
The first element in the group.
What are the metals in the middle of the periodic table known as?
Transition metals.
What makes an atom neutral?
Having the same amount of protons and electrons.
Polonium has an atomic number of 84 and an atomic mass of 209. How many neutrons does Polonium have?
It has 125 neutrons.
Groups 13 through 16 are the only groups that contain at least one what?
Metalloid.
What increases as you move from left to right in a row?
Atomic number.
What is the most reactive alkaline earth metal?
Radium.
The amount of energy an electron has depends on what?
Its distance from the nucleus.
What element has 117 neutrons in its nucleus?
(hint: it is a transition metal)
Platinum.
What two things increase as you move down a column?
Reactivity and atomic size.
What are the only two elements that are liquid at room temperature?
Bromine and Mercury.
What group of elements on the periodic table are the most unreactive?
The noble gases (group 18).