Atomic Models Test Flashcards
What does atomos mean
Indivisible
Proposed atomic theory, an atom is an indivisible, indestructible, tiny sphere
John dalton-1803
Atoms of the same element are exactly alike, atoms of different elements are different
John dalton-1803
Who proposed the “plum pudding” model
J.J Thomson-1898?
Who discovered electrons?
J.J Thomson
Who shot positively charged particles at a thin sheet of gold foil
Ernest Rutherford-1911
Proposed that atoms had a small dense positively charged center called the nucleus
Ernest Rutherford-1911
All positively charged particles of the atom are in the nucleus, all negatively charged electrons were scattered outside the nucleus
Ernest Rutherford-1911
Who proposed that electrons move in definite orbits around the nucleus?
Niels Bohr-1913
His atomic model placed electrons in specific energy levels to explain why they did not spiral toward and collide with the nucleus
Niels Bohr-1913
Who proposed in the wave/modern model that electrons don’t move around an atom in a definite path?
Erwin Schrodinger-1933
What was daltons model called?
Billiard ball model
Who proposed that electrons orbit the nucleus in shells
Niels Bohr
Who proposed that electrons can be bumped up to a higher shell if hit by an electron or a photon of light
Niels Bohr
Who proposed that all matter is made up of atoms
John dalton-1803
Who proposed that atoms are mostly empty
Ernest Rutherford
What are isotopes
Atoms of the same element that have different numbers of neutrons
First to develop the idea that matter was made of particles called atoms
Democritus -460 B.C.
Are atoms positive or negative?
Neither they are neutral
The central part of an atom is the what?
The nucleus
What carries electrons?
The electron cloud
What are the 3 subatomic particles?
Protons, neutrons, and electrons
Where are protons located?
Inside the nucleus
Do protons have mass?
Yes
Are protons positively or negatively charged?
Positively charged
All atoms of a particular element have the same # of what?
Protons
Where are electrons located?
Outside the nucleus and inside the electron cloud
Are electrons positively or negatively charged?
Negatively charged
Most mass of an atom comes from the what?
Nucleus
Electrons have very lil what?
Mass about 1/1836 the mass of the proton
Electrons and protons are what?
Equal therefore they cancel eachother out there is never more of one than another
Where are neutrons located?
Inside the nucleus
What kind of charge do neutrons have?
A neutral charge
The neutron has the same mass as the what?
Proton
The atomic number in the periodic table is always the what?
Whole number
Atomic mass is a what on the periodic table
Decimal
