Discovering the Atom
Atomic Structure
Metals, Nonmetals, and Metalloids
Periodic Table
Random
100
Mendeleev created the first periodic table by arranging elements in order of _____.
Increasing Atomic Mass
100
In an atom, the number of protons equals the number of _____.
electrons
100
Most metals are NOT _____ except for mercury.
liquid at room temperature
100
What information in the periodic table indicates the number of protons in an atom?
the Atomic Number
100
A material is said to be ductile if it _____.
can be spread out into a thin wire
200
How did chemists change Mendeleev’s periodic table in the early 1900s
They used atomic number instead of atomic mass to organize the elements.
200
Which particles in atoms have a negative electric charge?
Electron
200
Which group contains the most elements
Metals
200
The maximum number of electrons the second level of an atom can hold is _____.
8
200
Lithium, Sodium, Potassium, and Cesium are part of a family called _____.
Alkali Metals
300
The modern periodic table is organized based on ________
Atomic Number
300
Which particle in the atom has a neutral charge?
Nuetron
300
What type of metal includes the familiar metals such as gold, silver, copper, and nickel.
Transition Metals
300
The maximum number of electrons the first level of an atom can hold is _____.
2
300
The horizontal rows in the periodic table are known as ____________________.
Periods
400
When creating the periodic table they divide up even more into __________ (18) and _____________(7)
Groups and Periods
400
The ____________________ is the very small center core of an atom.
Nucleus
400
Which group of elements shares characteristics with both metals and nonmetals
Metalloids
400
Each element is given a specific _________________________ that usually consists of one or two letters.
Chemical Symbol
400
How do you find the number of neutrons in an atom?
Atomic Mass- Atomic Number
500
When creating the modern periodic table they divided up the elements into three groups. What are the three groups?
Metals, Metalloids, and Non-metals
500
____________________ are smaller particles that make up protons and neutrons.
Quarks
500
Nonmetals are ____________________ conductors of heat and electricity.
Poor
500
In the periodic table, the most reactive metals are found in which group?
Group 1, Alkali Metals
500
What are two characteristics of Nonmetals
Poor conductors and Brittle Solids at room temperatures
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