Unit 4, Dr. Willis Unit test

Question Answer
the total number of protons and neutrons in an element is the atomic number or mass number? mass number
Protons or neutrons have no electric charge? neutrons
Electrons are found in the nucleus or electron cloud of an atom? electron cloud
The mass number or atomic mass is an average of the masses of all naturally occurring isotopes in an element? atomic mass
All atoms of the same element contain the same number of protons, neutrons or electrons? protons
Isotopes exist because atoms of the same element can have different number of protons, neutrons, electrons, none of these neutrons
An atom of water has 50 protons, 50 electrons and 100 neutrons would have a mass number of 100,200, 150, none of these. 100
An atom doesn't have an electrical charge if it contains equal numbers of electrons and protons, protons and neutron, neutrons and electrons, none of these? electrons and protons
An atom of carbon has 9 protons, 9 electrons and 12 neutrons. The mass number is 19, 21, 18, 12? 18
The isotope magnesium has 29 protons. Another isotope of magnesium 436 contains 92, 29, 143 electrons? 29
An element's atomic number is equal to its number of protons, neutrons, valence electrons, protons and neutrons? valence electrons
How can you tell the difference in isotopes? Look at the atomic number, look at the number of protons, look at the mass number or look at all of these? look at the mass number
Which of these determines the identity of an element? the atomic number, mass number, atomic mass, overall charge atomic mass
Energy levels determined by protons, electrons, neutrons, photons electrons
Democritus, Dalton, Thomson Rutherford, Bohr all contributed to the development of the atomic theory. True or False True
2 Different isotopes have different numbers of electrons, neutrons, protons, atomic number neutrons
Unequal number of electrons and protons gives us an ion. True or false True
The orbital levels are, x, d, s. True or false false
This has least mass: proton, neutron, electron, valence electron
Atoms jump levels when atoms: they become charged, they loose orbit, they loose or gain energy loose or gain energy
Atoms that are isotopes of each other are: same element, different element, have different charges, different properties same element
Dalton did not say atoms are made of electrons. True or False True
Thomson discovered that atoms contain: electrons, molecules, anode, nucleus electrons
Thomson changed Dalton's atomic theory because he discovered that atoms were made up of even smaller particles and this showed that Dalton's theory was wrong. True or False True
Who proved there was an atomic nucleus? Thomson, Rutherford, Dalton, Democritus Rutherford
Total no. of electrons in third level? 6, 16, 18, 28 18
Who discovered small particles inside the atom? Bohr, Dalton, Thomson, Rutherford Thomson
Isotopes have different atomic mass,mass numbers, electrical properties, charges mass numbers

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