atomic theory

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the proton has a mass of ______

1 amu

name dalton's 4 postulates

1. all elements are composed of atoms 2. atoms of the same element are identical, the atoms of one element are different from another 3. atoms of different elements mix in whole number ratios 4. in chemical reactions, atoms of one element never change to another

mass of an electron is

1/1840 amu

if an atom has 10 electrons, how many protons does it have

10

an atom of argon has 18 protons and 22 neutrons. how many electrons does it have

18

what year was the plum pudding model made

1897

mass of a neutron is

1amu

a phosphorus atom has 15 protons and 16 neutrons. what is the mass number

31

how many electrons are in an atom with an atomic number of 50

50

an element has a mass number 12 and atomic number 6... how many neutrons does it have

6

an element with a mass number of 11 and an atomic number of 5 has how many neutrons

6

oxygen has 8 protons. what is oxygen's atomic number?

8

Who made the Atomic Model and in what year

Bohr in 1911

Who made the Quantum Mechanical Model and in what year?

Erwin Schrodinger in 1926

who discovered the proton

Eugene Goldstein

who discovered the electron

JJ Thomson

the electron was discovered in 1897 by______

JJ thomson

who discovered the neutron

James Chadwick

who stipulated that electrons orbit the nucleus at fixed energies and distances?

Niels Bohr

What was the plum pudding model?

a positive sphere with electrons

atoms with a negative charge

anion

what type of ion contains an element name with "ide" on the end

anion

which philosopher stated that matter was made of four elements:earth wind water and fire

aristotle

soon after bohr's planetary model took center stage, experiments showed that electrons behaved____

as both particles and waves

the _____________of an element is the weighted average of the masses of the different isotopes of that element

atomic mass

what is an isotope

atoms with the same number of protons but different number of neutrons

atom with a positive charge

cation

Dalton proposed that atoms_____

could neither be created nor destroyed

who first proposed that everything in the world was made up of tiny particles

democritus

what conclusion was made from rutherford

dense and empty nucleus

which particles are not included in the mass number

electrons

what conclusion was made from bohr's model

electrons stay in orbits

dalton concluded that the various compounds were combinations of atoms of different_____

elements

which scientist became known as "the father of the nuclear age"

ernest rutherford

whose experiment involved shooting positively charged alpha particles at a sheet of gold foil

ernest rutherford

democritus called the tiniest particles of matter "atomos", which is Greek for____

indivisible

an atom or group of atoms that has a positive or negative charge

ion

whose model showed atoms as uniformly packed spheres of positive matter filled with negatively charged electrons

jj thomson

in 1808, who was the Quaker teacher that challenged Aristotelian theory?

john dalton

who conducted the billiard ball model and in what year

john dalton and democritis in 1800

as electrons circling an atom shift between energy levels, they absorb or release energy in the form of____

light of a specific wavelength

the _________ is always equal to the number of protons and the number of neutrons that the atom has

mass number

an atom that gains an electron will have a ________ charge

negative

who drew on the work of planck and einstein to develop the planetary model of the atom

niels bohr

the mass of an atom is located in the _______ and the volume of an atom is made of the_____

nucleus, electron cloud

what is the atomic number

number of protons

what model did thomson create

plum pudding

the nucleus is _______ charged whereas the electron cloud is ______ charged

positively, negatively

what subatomic particles would you find in the nucleus of an atom

protons and neutrons

which subatomic particles contribute the most to the mass of an atom

protons and neutrons

who concluded that atoms consisted largely of empty space with most of the mass concentrated in the center?

rutherford

who concluded the planetary model and in what year

rutherford in 1909

JJ Thompson won a nobel prize in 1906 for his discovery of_____

the electron

what conclusion was made from quantum model

the electron cloud is fuzzy; electrons have dual wave particle characteristics

what did thomson's model conclude

the existence of the electron and their negativity

most of the mass of an atom is contained in _____

the nucleus

rutherford referred to the center of the atom, where the mass was concentrated, as ________

the nucleus

what is the mass number

the number of protons and neutrons

what is true about a neutral atom

the number of protons equal the number of electrons

the current model of the atom, where electrons exist within a range of possible locations, is called______

the quantum model

Dalton showed that common substances always broke down into____

the same elements in the same proportions

Who showed it was impossible to determine both the exact position and speed of electrons as they moved around an atom?

werner heisenberg


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