Atomic Model
Which of the following did the Greeks believe?
a)Fire
b)Earth
c)Water
d)Wind
e)All The Above
E) All The Above
Greeks believed in the four elements wind, fire, water, earth
What particles make up the atom
a) neutrons, protons, electrons
b) neurons, Jacob Yamen, potatoes
c) neutrons, electrons, neurons
A)Neutrons, protons and electrons are the three particles which make up an atom
Neurons, potatoes and Jacob Yamen are not found in atoms
____ electrons are stable
_____ electrons have more energy and bounce to different PELs
Ground state electrons stay in their energy levels
Excited electrons gain energy an bounce to higher PELs and then when they lose energy they go back down a level
____ is released when an electron falls from an excited state to its ground state
Electrons release visible light as they drop down a PEL and each one is specific to each element
the sum of the neutrons and protons in an atom equates to___
the mass number
The father of modern chemistry?
Dalton-first model of the hard sphere model
Protons, neutrons, and electrons take on which charges
Proton-positive
Neutron-neutral
Electron-negative
T/F- Isotopes have different amounts of protons than their element
F-isotopes are different forms of the element which have different numbers of neutrons however, they can never have different numbers of protons or they would be considered a different element
a)Electron configuration a)shows valence electrons
b) PEL b) describes how the electrons are arranged in an atom
c)Lewis dot structure c) principle energy level
a-b electron configuration represents the electrons arranged in the atom
b-c principle energy levels show the shells in the atom
c-a Lewis dot structure is the symbol of the element with the dots next to it representing the amount of valence electrons
T/F the average atomic mass is the masses of all the possible naturally occurring Isotopes
T- the average of all the naturally occurring isotopes of the element is equal to the atomic mass of such element
All the following were Dalton's conclusions except
Atoms can be destroyed, can be created, or and can subdivide
Compounds are formed by the combination of different elements.
All elements are composed of indivisible atoms.
All atoms of a given element have identical properties
1.
Atoms cannot be created or destroyed, or subdivided
Ions are...
Charged particles which have an equal number of electrons and protons
Match-
a) ion a) different numbers of electrons
b) isotope b) different number of neutrons
c) atom c) most probable location of an electron
d) orbital d) basic unit of chemical elements
a-a ions have different electron values
b-b Isotopes have different neutron values
c-d atoms make up all elements
d-c electrons are most likely found in orbital s moving around the nucleus
How many PEL are present in the atom of Uranium
7- each row in the periodic table represents the increasing energy level, Uranium is in the 7th row meaning it has 7 PELs
T/F electrons are the heaviest between protons and neutrons
F- electrons weigh about 1/2000 amu of both neutrons and protons which weigh about 1 amu
Atoms are mostly Empty Space- True or False
True- the Gold foil experiment conducted by Rutherford concluded that the alpha particles passed through the atom.
Determine the number of P,N,E, charge and atomic mass of CA2+
P-20
N-20
E-18
Mass-40
Charge-2+
____ created the solar system model which shows electrons orbit the nucleus I specific energy levels
Neils Bohr was the scientist who discovered that stimulated elements give off specific amounts of energy
P indicates 4p^3 ___
the shape of the orbital
T/F in order to calculate the number of neutrons in the nucleus of an atom you subtract the number of protons from the mass number
T- when you calculate the amount of neutrons you subtract the protons from the atomic mass-ex:Calcium, the amu is 40 and the amount of protons is 20
40-20= 20 there are 20 neutrons in the nucleus of calcium
What is one conclusion we can draw from the Gold Foil experiment
The atom is mostly empty space
Atoms have a dense, positive nucleus
Negatively charged particles are located outside the positive nucleus
What is an orbital?
a) where neutrons are found in the nucleus
b) location of protons in the atom
c) most probable location of electrons
d) Where you can locate Jacob Yamen
C) electrons are most probably found in orbital surrounding the nucleus moving extremely fast
orbitals do not show protons location or neutron location or Jacob yamen
Find the mass, charge and nuclear charge
10 protons
12 neutrons
8 electrons
Mass-22 amu
Charge-2+
Nuclear charge- 10+
Which is the most recent model developed to show the orbitals of electrons inside the atom
a) Bohr model
b) plum pudding model
c) hard spheres model
a) Bohr's model shows a structural model in which an electron moves around the nucleus only in circular orbits, each with a specific allowed radius
The plum pudding shows negatively charged particles embedded in a sea of positively charged particles
The hard sphere model only showed the atom as a hrad indivisible sphere
Calculate Average Atomic Mass
Mass number: Percent Abundance ukn element
84 79.34%
80 20.66%
steps:
Convert % to decimal
Multiple decimals by its mass #
add up the products
84 x .7934=66.6456
80 x .2066=16.528
66.6456+16.528=(83.1736 amu)