Chapter 4 Flashcards
(23 cards)
The______ and the ______are the subatomic particles found in the nucleus.
Protons, neutrons
The smallest sub atomic particle is the _______. it has a ________charge.
Electron, negative
The______ has a positive charge.
Proton
The_____ has no charge.
Neutron
The smallest particle of an element that retains the properties of that element is a(n)________.
Atom
The mass number is the sum of the number of the _______ _______and for the number of______.
Atomic number, neutrons
The number of _______equals the number of______. Otherwise the Adam would be a charged particle.
Electrons, protons
All atoms of the same element have the same number of_______.
Protons
Isotopes of an element have a different number of,______ but the same number of _____and_______.
Neutrons, protons and electrons
The number of neutrons is calculated by _________the______ _______from the______ _______.
Subtracting, atomic number, mass number
The mass number will be a _______number, while the atomic mass will be a _______number.
Whole, decimal
True or false?
The nucleus has a positive charge.
True
True or false?
Atoms of the same element (a.k.a. isotopes) have different mass numbers.
True
True or false?
In the Rutherford or nuclear model of the atom, atoms are mostly empty space.
True
True or false?
Atoms of isotopes of an element have different numbers of protons.
False
True or false?
The reason JJ Thompson reasons that electrons must be part of the atoms of all elements was because the charge to mass ratio of the electrons was the same, regardless of the gas used or material used as the anode or cathode
True
True or false?
Atoms are neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons.
False
True or false?
Atoms are neutral with the number of protons equaling the number of electrons.
True
True or false?
Chemists use the relative masses of atoms compared to C-12 rather than the actual masses of the atoms because the actual masses of atoms are very small and difficult to work with.
True
True or false?
Chemists use the relative masses of atoms compared to a reference isotope rather than the actual masses of the atoms because the number of the sub atomic particles in atoms of different elements varies.
False
True or false?
The atomic mass of an element is the average of the mass number and the atomic number for the element.
False
True or false?
The atomic mass of an element is the weighted average of the masses of the isotopes of the element.
True
What did Democritus believe about the atom?
Indestructible and indivisible
