Atoms And The Periodic Table Question Preview (ID: 62437)
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An atom’s mass number is 200 and its atomic number is 80. How many neutrons does the atom have?
a) 80
b) 120
c) 200
d) 280
Think about a metal desk and a pencil. What do these two objects always have in common?
a) Both are made of atoms.
b) Both have the same mass number.
c) Both are made of the same kind of atom.
d) Both are made of the same number of atoms.
Which of the following scientists added negatively-charged particles to the model of the atom?
a) Niels Bohr
b) John Dalton
c) Ernest Rutherford
d) J. J. Thomson
Beryllium is an element. What is the smallest particle of Beryllium that has all the chemical properties of calcium?
a) an atom of Beryllium
b) a proton from a Beryllium atom
c) an electron from a Beryllium atom
d) a molecule that contains Beryllium
Where is the nucleus located in the atom?
a) in the center
b) In the electron cloud
c) Left of center
d) inside the electrons
What does a box on the periodic table represent?
a) an element
b) a compound
c) a group
d) a period
What type of element are semiconductors?
a) metalloids
b) metals
c) nonmetals
d) liquids
Which describes how elements are arranged in the periodic table?
a) by increasing atomic number
b) by increasing atomic mass
c) alphabetical
d) by chemical symbol
Which are properties of metals?
a) Brittle and clear
b) Liquid and dull
c) Conductive and ductile
d) Gaseous and unreactive
Which of the following is not made up of atoms?
a) subatomic particles
b) elements
c) molecules
d) pure substances
What is the atomic mass of an atom that has 6 protons, 6 electrons, and 7 neutrons?
a) 13
b) 6
c) 14
d) 12
The current model of the atom shows electrons in a cloud surrounding the nucleus. How does the electron cloud model differ from the Bohr model?
a) The electron cloud shows there is not empty space in an atom.
b) The electron cloud shows that electrons do not have a negative charge.
c) The electron cloud shows a region in which electrons are likely to be found.
d) The cloud shows that all the electrons combine together to form one mass.
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