Scientists
What did John Dalton discover?
Elements combine in specific ratios to form compounds because elements are composed of single atoms.
What does the number above an element symbol represent?
Number of protons/neutrons
What particle in an atom has no charge?
Neutron
Does a metalloid have characteristics of a metal or a nonmetal?
They have characteristics from both?
How many atoms does an element consist of?
1
What is the main difference in Niehls Bohr's atomic model and our current one?
Our model says electrons cannot move from one orbit to another. It also says that electrons do not have orbits around the nucleus
What are the horizontal columns in the periodic table called?
Periods
Which particle(s) do not affect the atomic mass a lot?
Electrons
What is Fluorine's symbol?
F
What was John Dalton's definition of an atom?
A small particle that cannot be created, destroyed, or divided.
Does the number of neutrons in an atom equal the number of protons?
No
What particle(s) make up the nucleus?
Protons and Neutrons
Which one is the most malleable?
Metal
How many elements are in the periodic table?
118
What was Ernest Rutherford's experiment?
He shot alpha particles at a very thin piece of gold foil.
How many groups are there in the periodic table?
18
What is the mass of an electron?
Two-thousandth of 1 amu
What does it mean to be ductile?
The degree to which a material can sustain plastic deformation under tensile stress before failure.
Or amount it can be reshaped. Like metal turning into a wire
What is the 1st element on the periodic table?
Hydrogen
Who discovered that there were small particles within an atom?
J.J Thomson
What does the number under the element symbol represent?
The atomic mass
What did scientists define the mass of a proton as?
1 amu
Which one is the most brittle?
Nonmetals
What is Mercury's symbol?