Atomic Structure Flashcards
What is the smallest part of an element that can exist?
Atom
What is an element?
A substance containing only one type of atom
What is a compound?
A substance containing 2+ elements chemically combined in fixed proportions
What is a mixture
A substance containing 2+ elements or compounds that aren’t joined together
State the law of the conservation of mass
Atoms cannot be created or destroyed in a chemical reaction
Who devised the plum pudding model
JJ Thompson
Who concluded that there is a nucleus
Ernst rutherford
Who discovered neutrons
James Chadwick
Who refined the nuclear model so electrons orbited the nucleus
Nicolas Bohr
What is the relative atomic mass formula for an isotope?
AR=(mass of isotope 1 * % of isotope 1)+(mass of isotope 2 * % of isotope 2)/100
What is the mass of a proton and a neutron?
1
What is the charge of a proton?
1
what is the charge of a neutron?
0
what is the charge of a electron?
-1
what is the mass of an electron?
almost 0
what is an isotope?
an atom of the same element with a different number of neutrons?
in what order are elements placed in in the periodic table
order of atomic weight
which group of the periodic table contains alkali metals?
one
which groups of elements are unreactive
8 and 0
which group contains halogens
7
