31 terms

Unit 9: Atoms & The Periodic Table Of Elements


Terms in this set (...)

What is in an atom?
Nucleus, protons, neutrons, and electron cloud
The atomic number of an element is the same as the number of
The number of protons in an atom is equal to the number of
Because protons and electrons are equal, what is the overall charge of an atom?
The atomic mass is calculated by adding what and what together?
Protons and neutrons
If an atom has 9 protons, 10 neutrons, and 9 electrons, what is the atomic number? Atomic mass? Element? Symbol?
An isotope is when you have the same number of protons in the nucleus, but a different number of
In a Bohr model, how many electrons can fit on the first energy level? Second? Third?
Where are the valence electrons located?
Outermost shelll
How many valence electrons does Aluminum have?
Valence electrons have the most (blank) and are more likely to do what?
Energy, interact with other atoms to form bonds
Using the Lewis Dot Diagram, what are the most valence electrons an atom of an element can have?
Periods on your periodic table are the same as the (blank) How many periods are there?
Horizontal rows, 7
Families and Groups on your periodic table are the same as (blank) How many groups or families are there?
Vertical columns, 18
What are the 3 main types of metals? What are most of the elements?
Metals, Nonmetals, and Metalloids, Metals
What are the four properties of metals?
Luster, Ductility, Malleability, Conductivity
What are properties of Nonmetals?
Dull, Brittle, Poor Conductors
Why are Metalloids named that?
Properties of both metals and Nonmetals
Where is the group or family that is the most unstable or reactive located? What is his group called?
Far left, Alkali Metals
Why are the alkali metals the most reactive?
They only have 1 valence electron in the outer shell
What the elements in the second group called?
Alkaline Earth Metals
Where are the transition metals located?
Groups 3-12
Name some common transition metals
Gold, Copper, Silver, Nickel
All metals at room temperature are in what phase or state of matter?
Where are the most stable or non reactive located?
Far right column
What are the most stable elects called?
The Noble Gases
Where are Metalloids located?
Make up the border between Metals and Nonmetals
The elements in the periodic table are arranged in order according to their
Atomic number
The reactivity of the elements tends to (blank) from left to right across the table.
Many Nonmetals are in what state or phase of matter at room temperature?
Elements in the same group or family have similar (blank), and they have the same number of (blank).
Characteristics, valence electrons