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Chemistry and Atoms
A list of elements and terms
21
Science
8th Grade
05/03/2007

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Term
nucleus
Definition
A group of atoms bound in a structure, such as a benzene ring, that is resistant to alteration in chemical reactions. The nucleus contains only protons and neutrons.
Term
protons
Definition
A positively charged particle held in the nucleus
Term
neutrons
Definition
A neutrally charged particle held in the nucleus
Term
electrons
Definition
A negatively charged particle orbiting around the nucleus
Term
Hydrogen
Definition
The first and lightest element in the periodic table.
Term
How many protons does Hydrogen have?
Definition
1
Term
Name the first three noble gases.
Definition
Helium, Neon & Argon.
Term
Name the first three elements in Period 1A.
Definition
Hydrogen, Lithium and Sodium
Term
How many shells are there in the second inner shell?
Definition
Eight
Term
What is the origin of the term Atom?
Definition
The term Atom came from the Greek word "Atomus" which means undividable.
Term
How many non-metal elements are there?
Definition
22
Term
What is the heaviest natural element?
Definition
Uranium
Term
On which part of the periodic table are the most reactive metals
Definition
Period 1A
Term
Is there a lot of space in an atom?
Definition
Yes
Term
Who made the earliest model of an Atom?
Definition
John Dalton (1808)
Term
Which civilization suggested that the atom was a large ball?
Definition
The Ancient Greeks.
Term
Who in the modern era confirmed that the atom was a large ball?
Definition
John Dalton
Term
Who discovered the electron
Definition
Sir Joseph John Thomson
Term
Who suggested the plum pudding model?
Definition
Sir Joseph John Thomson
Term
Who was Ernest Rutherford's teacher?
Definition
Sir Joseph John Thomson
Term
What famous experiment did Ernest Rutherford do to prove that atoms are made of empty space?
Definition
The gold foil experiment, where alpha particles are fired at a gold foil. Most of the atoms were able to get through
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