Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
14 Cards in this Set
- Front
- Back
|
Who said all elements are composed of atoms.
Atoms are indivisible and indestructible
Atoms of the same element are exactly alike.
Atoms of different elements are different.
Compounds are formed by joining atoms from two or more elements.
|
John Dalton |
|
|
Who discovered the nucleus?
|
Ernest Rutherford
|
|
|
What is atomic radius? |
The distance from the center of the nucleus to furthest outward atom |
|
|
What is electron affinity? |
The amount of energy released when an electron is added to a stable atom |
|
|
What two particles are found in the nucleus and why does the nucleus contain the mass of the atom? |
Protons and neutrons are found in the nucleus and contribute the majority of the mass in the atom since they have a higher mass than the electrons. |
|
|
What is Ionization Energy? |
The amount of energy required to remove an electron from an atom. |
|
|
How does ionization energy change as you go across and down the periodic table? |
As you go across it increases and as you go down it decreases. |
|
|
What group is group 17? |
Halogens |
|
|
What group is group 18? |
The noble gases |
|
|
What group is group 1? |
The Akali Metals |
|
|
What group is group 2? |
The Alkaline Earth Metals |
|
|
What group is located in the middle of the periodic table? |
Transition Metals |
|
|
What element does not belong to any group? |
Hydrogen |
|
|
Who determined the atomic mass of the atom? |
Henry Mosely |
