Element Name
Element Symbol
Atoms
Periodic Table
Discovery
100
H
Hydrogen
100
Carbon
C
100
What is the center of an atom?
A nucleus
100
What is the group in the middle of the periodic table called?
Transition metals
100
Who developed the basis for modern atomic theory?
John Dalton
200
O
Oxygen
200
Ca
Calcium
200
What are the positive and negative parts of an atom?
Protons and electrons
200
What is the Group I called on the periodic table?
Alkali metals
200
What law shows that carbon dioxide always contains 2.7 g of oxygen for every 1 g of carbon?
Law of Constant Composition
300
Au
Gold
300
Manganese
Mn
300
What is the neutral part of an atom?
Neutron
300
On the periodic table, what is Group 17 (7A) called?
Halogens
300
What part(s) of Dalton's original atomic theory was proven incorrect?
Atoms of a given element are identical. and Atoms cannot be destroyed, made, or changed to another element.
400
K
Potassium
400
Sodium
Na
400
What are two atoms of the same element with different neutrons?
Isotopes
400
Silicon is an example of a _______?
Metalloid
400
Who discovered the nucleus?
Ernest Rutherford
500
Sn
Tin
500
Iron
Fe
500
What is the symbol for an atom with 17 protons, 18 neutrons, and 17 electrons?
35 Cl 18
500
What are Group 18 (8A) elements called?
Noble gases
500
How were electrons discovered?
J.J Thomson discovered the electron using cathode ray tubes.
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