Who first introduce the idea of the Atomic Theory?
Demortis
100
What is radioactivity?
The process of the particles being emitted from a nucleus as a result of nucleus instability
100
What direction are groups on the periodic table?
vertical
100
What are the 4 basic types of bonding?
Ionic,Covalent,Sigma and Pi bonds.
200
What type of mixture is gravel an example of?
He- Heterogeneous
200
What's was Dalton's main contribution to the math community?
The law of multiply proportion
200
The amount of time required for a decaying substance to lose half of its original amount is?
Half life
200
What are valance electrons?
Valance electrons are the outermost electrons involved in chemical bonding
200
What is the otacrule?
Where Ionic bonds always want to be with 8 valence electrons.
300
What type of change occurs when a glue gun melts a glue stick
physical change
300
What experiment did J.J Thompson do?
Cathode Ray Tube Experiment
300
What is Beta Decay?
Type of decay in which an electron is emitted
300
What are the main group elements?
Group 1, 2, and 13-18
300
What is polar covalent bond?
A bond where electrons are shared unequally between the atoms.
400
Which of the following is an example of a physical change?
A. Iron is exposed to air produces rust
B. Hydrogen combined with oxygen forms water
C. Sulfur combined with oxygen produces sulfur dioxide
D. Liquid nitrogen exposed to air become nitrogen gas.
D. Liquid nitrogen exposed to air become nitrogen gas.
400
What was the name of J.J Thomson's Model?
Plum pudding
400
What is the atomic number that makes elements unstable
Anything over 83
400
What is ionization energy?
The energy required to remove a electron from an atom
400
What is the difference between a cation and an anion
Cation is a positive ion which metals form, more protons then electrons
Anion is a negative ion which non metals form, more electrons the protons
500
What is a physical property of sulfur?
Its melting point is 112 Celsius
500
Was Bohr's planetary model of the atom different from the current atomic model? why?
It is different in a way that there was only 2 rings around Bohr's model and in the current model there is more depending on the element.
500
What is the heaviest form of nuclear decay?
Alpha
500
What group is the Halogens found in?
Group 17
500
What type of ions do transition metals compounds form?