History
Which of the following was one of Dalton's ideas? a: All substances are made of atoms B: Atoms can be divided C: Atoms can be destroyed d: some substances are made of atoms
What is : A: All substances are made of atoms
What is the smallest thing in the world?
an atom
Neutron is _______ charged
What is : uncharged/ neutral
How are the atoms arranged on the periodic table?
What is in order of increasing atomic number
what two particles make up an atom's nucleus?
What is : protons and neutrons
What number is Carbon
6
What do the period numbers tell you about an atom?
How many electron shells an element has
How does the mass of an electron compare to the mass of protons and neutrons?
It is much smaller
What is the negative part of an atom?
Electron
The current atomic theory includes the ________ model
What is : electron cloud
What do the group numbers tell you about an atom?
How many electrons are on the outermost level
What element does not belong in a group?
Hydrogen
In an atom, which has the least mass? A: nucleus B: proton C: neutron D: electron
electron
what are the three particles in an atom
neutron, proton, electron
What is: Mg
magnesium
what is the two largest particles in an atom
neutrons and protons
How did Mendeleev order the PTE?
atomic mass
Describe the difference between atomic number and mass number
The atomic number is the number of proton in an atom. The Mass number is the sum of the number of protons and neutrons in an atom of a particular isotope
what is an isotope?
an element that has the same number of protons but different numbers of neutrons.
What are the most reactive metals called? what group are they in?
What are the most stable elements called? What group are they in?
Alkali, group 1.
Noble gases, group 18
The 17th group of elements are the most reactive non-metals. What are they called?
Hallogens